Add build for all pull requests on GitHub (#44)

* Add build for all pull requests on GitHub
* Add matrix for all supported Java versions

(cherry picked from commit 9d8de2f)

.github/workflows/build-pull-request.yaml

@@ -0,0 +1,33 @@
+name: Build Pull Request
+on: pull_request
+
+env:
+  MOZ_HEADLESS: true
+
+jobs:
+  build:
+    name: Build pull request
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        java: [ 8, 11, 17 ]
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: ${{ matrix.java }}
+
+      - name: Setup Firefox
+        uses: browser-actions/setup-firefox@v1
+
+      - name: Setup GeckoDriver
+        uses: browser-actions/setup-geckodriver@latest
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Setup Gradle
+        uses: gradle/gradle-build-action@v2
+
+      - name: Build with Gradle
+        run: ./gradlew -Dci=true --no-daemon --continue build