Add GitHub Actions

Author: sgade

.github/workflows/build.yml

@@ -0,0 +1,19 @@
+name: Build
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: macos-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: swift-actions/setup-swift@v2
+      with:
+        swift-version: "5.10"
+    - name: Build
+      run: swift build -v