Migrate CI to use GitHub Actions.

Motivation:

To migrate to GitHub actions and centralised infrastructure.

Modifications:

Changes of note:
* Adopt swift-format using rules from SwiftNIO
* Remove scripts and docker files which are no longer needed

Result:

Feature parity with old CI.

.github/workflows/pull_request.yml

@@ -0,0 +1,30 @@
+name: PR
+
+on:
+    pull_request:
+        types: [opened, reopened, synchronize]
+
+jobs:
+    soundness:
+        name: Soundness
+        uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main
+        with:
+            license_header_check_project_name: "SwiftNIO"
+    unit-tests:
+        name: Unit tests
+        uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
+        with:
+            linux_5_9_arguments_override: "--explicit-target-dependency-import-check error"
+            linux_5_10_arguments_override: "--explicit-target-dependency-import-check error"
+            linux_6_0_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
+            linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
+            linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
+
+    cxx-interop:
+        name: Cxx interop
+        uses: apple/swift-nio/.github/workflows/cxx_interop.yml@main
+
+    swift-6-language-mode:
+        name: Swift 6 Language Mode
+        uses: apple/swift-nio/.github/workflows/swift_6_language_mode.yml@main
+        if: false  # Disabled for now.

.github/workflows/pull_request_label.yml

@@ -0,0 +1,18 @@
+name: PR label
+
+on:
+  pull_request:
+    types: [labeled, unlabeled, opened, reopened, synchronize]
+
+jobs:
+  semver-label-check:
+    name: Semantic Version label check
+    runs-on: ubuntu-latest
+    timeout-minutes: 1
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+      - name: Check for Semantic Version label
+        uses: apple/swift-nio/.github/actions/pull_request_semver_label_checker@main

.github/workflows/scheduled.yml

@@ -0,0 +1,17 @@
+name: Scheduled
+
+on:
+    schedule:
+        - cron: "0 8,20 * * *"
+
+jobs:
+    unit-tests:
+        name: Unit tests
+        uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
+        with:
+            linux_5_8_enabled: false
+            linux_5_9_arguments_override: "--explicit-target-dependency-import-check error"
+            linux_5_10_arguments_override: "--explicit-target-dependency-import-check error"
+            linux_6_0_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
+            linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"
+            linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error -Xswiftc -require-explicit-sendable"

.licenseignore

@@ -0,0 +1,40 @@
+.gitignore
+**/.gitignore
+.licenseignore
+.gitattributes
+.git-blame-ignore-revs
+.mailfilter
+.mailmap
+.spi.yml
+.swift-format
+.editorconfig
+.github/*
+*.md
+*.txt
+*.yml
+*.yaml
+*.json
+Package.swift
+**/Package.swift
+Package@-*.swift
+**/Package@-*.swift
+Package.resolved
+**/Package.resolved
+Makefile
+*.modulemap
+**/*.modulemap
+**/*.docc/*
+*.xcprivacy
+**/*.xcprivacy
+*.symlink
+**/*.symlink
+Dockerfile
+**/Dockerfile
+Snippets/*
+dev/alloc-limits-from-test-output
+dev/boxed-existentials.d
+dev/git.commit.template
+dev/lldb-smoker
+dev/make-single-file-spm
+dev/malloc-aggregation.d
+dev/update-alloc-limits-to-last-completed-ci-build

.swift-format

@@ -0,0 +1,62 @@
+{
+  "version" : 1,
+  "indentation" : {
+    "spaces" : 4
+  },
+  "tabWidth" : 4,
+  "fileScopedDeclarationPrivacy" : {
+    "accessLevel" : "private"
+  },
+  "spacesAroundRangeFormationOperators" : false,
+  "indentConditionalCompilationBlocks" : false,
+  "indentSwitchCaseLabels" : false,
+  "lineBreakAroundMultilineExpressionChainComponents" : false,
+  "lineBreakBeforeControlFlowKeywords" : false,
+  "lineBreakBeforeEachArgument" : true,
+  "lineBreakBeforeEachGenericRequirement" : true,
+  "lineLength" : 120,
+  "maximumBlankLines" : 1,
+  "respectsExistingLineBreaks" : true,
+  "prioritizeKeepingFunctionOutputTogether" : true,
+  "rules" : {
+    "AllPublicDeclarationsHaveDocumentation" : false,
+    "AlwaysUseLiteralForEmptyCollectionInit" : false,
+    "AlwaysUseLowerCamelCase" : false,
+    "AmbiguousTrailingClosureOverload" : true,
+    "BeginDocumentationCommentWithOneLineSummary" : false,
+    "DoNotUseSemicolons" : true,
+    "DontRepeatTypeInStaticProperties" : true,
+    "FileScopedDeclarationPrivacy" : true,
+    "FullyIndirectEnum" : true,
+    "GroupNumericLiterals" : true,
+    "IdentifiersMustBeASCII" : true,
+    "NeverForceUnwrap" : false,
+    "NeverUseForceTry" : false,
+    "NeverUseImplicitlyUnwrappedOptionals" : false,
+    "NoAccessLevelOnExtensionDeclaration" : true,
+    "NoAssignmentInExpressions" : true,
+    "NoBlockComments" : true,
+    "NoCasesWithOnlyFallthrough" : true,
+    "NoEmptyTrailingClosureParentheses" : true,
+    "NoLabelsInCasePatterns" : true,
+    "NoLeadingUnderscores" : false,
+    "NoParensAroundConditions" : true,
+    "NoVoidReturnOnFunctionSignature" : true,
+    "OmitExplicitReturns" : true,
+    "OneCasePerLine" : true,
+    "OneVariableDeclarationPerLine" : true,
+    "OnlyOneTrailingClosureArgument" : true,
+    "OrderedImports" : true,
+    "ReplaceForEachWithForLoop" : true,
+    "ReturnVoidInsteadOfEmptyTuple" : true,
+    "UseEarlyExits" : false,
+    "UseExplicitNilCheckInConditions" : false,
+    "UseLetInEveryBoundCaseVariable" : false,
+    "UseShorthandTypeNames" : true,
+    "UseSingleLinePropertyGetter" : false,
+    "UseSynthesizedInitializer" : false,
+    "UseTripleSlashForDocumentationComments" : true,
+    "UseWhereClausesInForLoops" : false,
+    "ValidateDocumentationComments" : false
+  }
+}

Package.swift

@@ -22,39 +22,44 @@ var targets: [PackageDescription.Target] = [
             .product(name: "NIO", package: "swift-nio"),
             .product(name: "NIOCore", package: "swift-nio"),
             .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .target(
         name: "NIOHTTPCompression",
         dependencies: [
             "CNIOExtrasZlib",
             .product(name: "NIO", package: "swift-nio"),
             .product(name: "NIOCore", package: "swift-nio"),
             .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .executableTarget(
         name: "HTTPServerWithQuiescingDemo",
         dependencies: [
             "NIOExtras",
             .product(name: "NIOCore", package: "swift-nio"),
             .product(name: "NIOPosix", package: "swift-nio"),
             .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .executableTarget(
         name: "NIOWritePCAPDemo",
         dependencies: [
             "NIOExtras",
             .product(name: "NIOCore", package: "swift-nio"),
             .product(name: "NIOPosix", package: "swift-nio"),
             .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .executableTarget(
         name: "NIOWritePartialPCAPDemo",
         dependencies: [
             "NIOExtras",
             .product(name: "NIOCore", package: "swift-nio"),
             .product(name: "NIOPosix", package: "swift-nio"),
             .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .executableTarget(
         name: "NIOExtrasPerformanceTester",
         dependencies: [
@@ -63,26 +68,30 @@ var targets: [PackageDescription.Target] = [
             .product(name: "NIOPosix", package: "swift-nio"),
             .product(name: "NIOEmbedded", package: "swift-nio"),
             .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .target(
         name: "NIOSOCKS",
         dependencies: [
             .product(name: "NIO", package: "swift-nio"),
             .product(name: "NIOCore", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .executableTarget(
         name: "NIOSOCKSClient",
         dependencies: [
             .product(name: "NIOCore", package: "swift-nio"),
             .product(name: "NIOPosix", package: "swift-nio"),
-            "NIOSOCKS"
-        ]),
+            "NIOSOCKS",
+        ]
+    ),
     .target(
         name: "CNIOExtrasZlib",
         dependencies: [],
         linkerSettings: [
             .linkedLibrary("z")
-        ]),
+        ]
+    ),
     .testTarget(
         name: "NIOExtrasTests",
         dependencies: [
@@ -92,7 +101,8 @@ var targets: [PackageDescription.Target] = [
             .product(name: "NIOPosix", package: "swift-nio"),
             .product(name: "NIOTestUtils", package: "swift-nio"),
             .product(name: "NIOConcurrencyHelpers", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .testTarget(
         name: "NIOHTTPCompressionTests",
         dependencies: [
@@ -102,55 +112,64 @@ var targets: [PackageDescription.Target] = [
             .product(name: "NIOEmbedded", package: "swift-nio"),
             .product(name: "NIOHTTP1", package: "swift-nio"),
             .product(name: "NIOConcurrencyHelpers", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .testTarget(
         name: "NIOSOCKSTests",
         dependencies: [
             "NIOSOCKS",
             .product(name: "NIOCore", package: "swift-nio"),
             .product(name: "NIOEmbedded", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .target(
         name: "NIONFS3",
         dependencies: [
-            .product(name: "NIOCore", package: "swift-nio"),
-        ]),
+            .product(name: "NIOCore", package: "swift-nio")
+        ]
+    ),
     .testTarget(
         name: "NIONFS3Tests",
         dependencies: [
             "NIONFS3",
             .product(name: "NIOCore", package: "swift-nio"),
             .product(name: "NIOEmbedded", package: "swift-nio"),
             .product(name: "NIOTestUtils", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .target(
         name: "NIOHTTPTypes",
         dependencies: [
             .product(name: "HTTPTypes", package: "swift-http-types"),
             .product(name: "NIOCore", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .target(
         name: "NIOHTTPTypesHTTP1",
         dependencies: [
             "NIOHTTPTypes",
             .product(name: "NIOHTTP1", package: "swift-nio"),
-        ]),
+        ]
+    ),
     .target(
         name: "NIOHTTPTypesHTTP2",
         dependencies: [
             "NIOHTTPTypes",
             .product(name: "NIOHTTP2", package: "swift-nio-http2"),
-        ]),
+        ]
+    ),
     .testTarget(
         name: "NIOHTTPTypesHTTP1Tests",
         dependencies: [
-            "NIOHTTPTypesHTTP1",
-        ]),
+            "NIOHTTPTypesHTTP1"
+        ]
+    ),
     .testTarget(
         name: "NIOHTTPTypesHTTP2Tests",
         dependencies: [
-            "NIOHTTPTypesHTTP2",
-        ]),
+            "NIOHTTPTypesHTTP2"
+        ]
+    ),
 ]
 
 let package = Package(
@@ -166,7 +185,6 @@ let package = Package(
     dependencies: [
         .package(url: "https://github.com/apple/swift-nio.git", from: "2.67.0"),
         .package(url: "https://github.com/apple/swift-nio-http2.git", from: "1.27.0"),
-        .package(url: "https://github.com/apple/swift-docc-plugin.git", from: "1.0.0"),
         .package(url: "https://github.com/apple/swift-http-types.git", from: "1.0.0"),
     ],
     targets: targets