tests: Run tests on Linux CI

The EndToEnd tests cannot currently be run:

* they deadlock when run under `swift test` (swiftlang#143)
* the CI requires the use of an HTTP proxy to download from the
  Internet, but SDK generator does not support proxies (swiftlang#145)

The tests are conditionally compiled only on Linux, so we must skip
them in CI.

Fixes swiftlang#45

Docker/docker-compose.yaml

@@ -25,7 +25,7 @@ services:
 
   test:
     <<: *common
-    command: /bin/bash -xcl "./Utilities/test.sh $${WARN_AS_ERROR_ARG-} $${SANITIZER_ARG-} $${IMPORT_CHECK_ARG-}"
+    command: /bin/bash -xcl "./Utilities/test.sh $${WARN_AS_ERROR_ARG-} $${SANITIZER_ARG-} $${IMPORT_CHECK_ARG-} --skip EndToEndTests"
 
   # util
 

Tests/SwiftSDKGeneratorTests/EndToEndTests.swift

@@ -48,6 +48,7 @@ final class EndToEndTests: XCTestCase {
     // Do multiple runs with different sets of arguments.
     // Test with no arguments by default:
     var possibleArguments = [""]
+
     do {
       try await Shell.run("docker ps")
       possibleArguments.append("--with-docker --linux-distribution-name rhel --linux-distribution-version ubi9")

Utilities/test.sh

@@ -13,8 +13,4 @@
 
 set -ex
 
-if [ "$(uname)" = Darwin ]; then
-    swift test $@
-else
-    swift build --build-tests $@
-fi
+swift test $@