add github actions

.github/workflows/d.yml

@@ -0,0 +1,38 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+name: D
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+
+    runs-on: ${{matrix.os}}
+
+    strategy:
+      matrix:
+        os: [macos-latest, ubuntu-latest, windows-latest]
+
+    steps:
+    - uses: actions/checkout@v3
+    - uses: dlang-community/setup-dlang@4c99aa991ce7d19dd3064de0a4f2f6b2f152e2d7
+
+    - name: 'Build & Test'
+      run: |
+        # Build the project, with its main file included, without unittests
+        dub build -b release --compiler=ldc
+        
+    - name: Upload
+      uses: actions/upload-artifact@v3
+      with:
+        name: build-${{matrix.os}}
+        path: ${{github.workspace}}/cac*