Test with GitHub Actions

.github/workflows/check.yml

@@ -0,0 +1,38 @@
+name: Check
+on: [ pull_request, push ]
+jobs:
+  check:
+    runs-on: ${{ matrix.os }}
+    # push: always run.
+    # pull_request: run only when the PR is submitted from a forked repository, not within this repository.
+    if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+        - ubuntu-latest
+        - macOS-latest
+        - windows-latest
+        gradle:
+        - "8.4"
+    steps:
+    - name: Set Git's core.autocrlf to false for Windows before checkout
+      run: git config --global core.autocrlf false
+    - uses: actions/checkout@v4
+    - name: Bump Gradle version
+      run: ./gradlew wrapper --gradle-version=${{ matrix.gradle }}
+    - name: Re-bump Gradle version
+      run: ./gradlew wrapper --gradle-version=${{ matrix.gradle }}
+    - name: Set up OpenJDK 8
+      uses: actions/setup-java@v3
+      with:
+        java-version: 8
+        distribution: "temurin"
+        cache: "gradle"
+    - name: Check
+      run: ./gradlew --stacktrace check
+    - uses: actions/upload-artifact@v3
+      if: always()
+      with:
+        name: ${{ matrix.os }}
+        path: build/reports