Add GitHub CI

.github/workflows/swift.yml

@@ -0,0 +1,24 @@
+name: Swift
+on: [push]
+jobs:
+  linux:
+    name: Linux
+    strategy:
+      matrix:
+        swift: [6.0.2]
+    runs-on: ubuntu-20.04
+    steps:
+    - name: Install Swift
+      uses: slashmo/[email protected]
+      with:
+        version: ${{ matrix.swift }}
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Swift Version
+      run: swift --version
+    - name: Build (Debug)
+      run: swift build -c debug
+    - name: Build (Release)
+      run: swift build -c release
+    - name: Test (Debug)
+      run: swift test -c debug