Unify GitHub Actions workflow

Author: ref-humbold

.github/workflows/ant-build-and-test.yml .github/workflows/build-and-test.yml.github/workflows/ant-build-and-test.yml renamed to .github/workflows/build-and-test.yml

@@ -1,8 +1,27 @@
-name: GitHub Actions (ANT)
+name: GitHub Actions
 
 on: [push, pull_request]
 
 jobs:
+  gradle-build-and-test:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-java@v4
+        with:
+          java-version: 17
+          distribution: temurin
+
+      - uses: gradle/actions/setup-gradle@v4
+
+      - name: Build
+        run: ./gradlew jar
+
+      - name: Test
+        run: ./gradlew test
+
   ant-build-and-test:
     runs-on: ubuntu-latest