Create Actions workflow

.github/workflows/build.yml

@@ -0,0 +1,54 @@
+name: Build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up JDK 11
+      uses: actions/setup-java@v3
+      with:
+        java-version: '11'
+        distribution: 'temurin'
+
+    - name: Build with Maven
+      run: |
+        if [[ "$GITHUB_REF" =~ ^refs/tags/ ]]; then \
+          PHASES="install site" \
+        elif [[ "$GITHUB_EVENT_NAME" = "pull_request" ]]; then \
+          PHASES="verify" \
+        else \
+          PHASES="deploy" \
+        fi && \
+          mvn -B -s config/settings.ci.xml $PHASES -PrunITs
+
+    - uses: actions/upload-pages-artifact@v1
+      if: ${{ startsWith(github.ref, 'refs/tags/' }}
+      with:
+        path: client/target/generated-docs
+
+  deploy-pages:
+    if: ${{ startsWith(github.ref, 'refs/tags/' }}
+
+    needs: build
+
+    permissions:
+      pages: write
+      id-token: write
+
+    environment:
+      name: github-pages
+      url: ${{ steps.deployment.outputs.page_url }}
+
+    runs-on: ubuntu-latest
+    steps:
+      - name: Deploy to GitHub Pages
+        id: deployment
+        uses: actions/deploy-pages@v2