Replace old GitHub action with updated one.

.github/workflows/ci.yml

@@ -0,0 +1,37 @@
+name: 'GitHub CI'
+
+on:
+  push:
+    branches:
+      - master
+      - main
+  pull_request:
+
+jobs:
+  build:
+
+    strategy:
+      matrix:
+        platform: [ubuntu-latest, macos-latest, windows-latest]
+        jdk: [17, 21]
+
+    runs-on: ${{ matrix.platform }}
+    name: on ${{ matrix.platform }} with JDK ${{ matrix.jdk }}
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up JDK ${{ matrix.jdk }}
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: '${{ matrix.jdk }}'
+          check-latest: true
+          cache: 'maven'
+      - name: Set up Maven
+        uses: stCarolas/setup-maven@v5
+        with:
+          maven-version: 3.9.6
+      - name: Build with Maven
+        env:
+          BROWSER: chrome-container
+        run: mvn -V --color always -ntp clean verify --file pom.xml '-Djenkins.test.timeout=5000' '-Dgpg.skip'