Add build-and-test action (#5)

.github/workflows/build-and-test.yaml

@@ -0,0 +1,56 @@
+name: Build and Test
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Define BUILD_LABEL
+        env:
+          INPUT: ${{ github.head_ref || github.ref_name }}
+        run: |
+          echo "BUILD_LABEL=${INPUT//\//_}" >> $GITHUB_ENV
+#      - name: Echo env
+#        run: env | sort
+
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - name: Set up Java
+        uses: actions/setup-java@v4
+        with:
+          java-version: '17'
+          distribution: 'adopt'
+      - name: Validate Gradle wrapper
+        uses: gradle/wrapper-validation-action@56b90f209b02bf6d1deae490e9ef18b21a389cd4
+        # 1.1.0
+
+      # From https://docs.sonarqube.org/latest/analysis/github-integration/
+      - name: Cache SonarCloud packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.sonar/cache
+          key: ${{ runner.os }}-sonar
+          restore-keys: ${{ runner.os }}-sonar
+
+      - name: Set build version
+        # Cannot use ${BUILD_LABEL} with gradle-build-action, so stuff version
+        # into gradle.properties
+        run: sed -i 's/^version.*/version = '${BUILD_LABEL}'/;' ./gradle.properties
+
+      - name: Run tests
+        uses: gradle/gradle-build-action@982da8e78c05368c70dac0351bb82647a9e9a5d2
+        # 2.11.1
+        with:
+          # Only write to the cache for builds on the 'main' branch (default - but here for documentation)
+          cache-read-only: ${{ github.ref != 'refs/heads/main' }}
+          arguments: check javadoc publish -s
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}