Add GH action workflow

Author: finestructure

.github/workflows/ci.yml

@@ -0,0 +1,38 @@
+name: CI
+
+on:
+  workflow_dispatch:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  macOS:
+    runs-on: macos-latest
+    strategy:
+    matrix:
+      xcode: ['13.4.1', '14.1']
+    steps:
+      - uses: actions/checkout@v3
+      - name: Select Xcode ${{ matrix.xcode }}
+        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app
+      - name: Get swift version
+        run: swift --version
+      - name: Test
+        run: swift test
+      - name: Build release
+        run: swift build -c release
+
+  Linux:
+      runs-on: ubuntu-latest
+      container:
+      image: swiftlang/swift@sha256:f212429011a4c3592ffaa660fd78b5bc149e9df7920da02dfc0e7a761582fa10  # swiftlang/swift:nightly-5.9-focal 2023-08-16
+      steps:
+        - uses: actions/checkout@v3
+        - name: Get swift version
+          run: swift --version
+        - name: Test
+          run: swift test
+        - name: Build release
+          run: swift build -c release