ci for java backend module

.github/workflows/github-actions.yml

@@ -0,0 +1,39 @@
+name: Java CI/CD with Maven
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 22
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'adopt'
+          java-version: '22'
+
+      - name: Cache Maven packages
+        uses: actions/cache@v3
+        with:
+          path: ~/.m2
+          key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
+          restore-keys: |
+            ${{ runner.os }}-maven-
+
+      - name: Build with Maven
+        run: mvn -B package --file pom.xml
+        env:
+          BOT_TOKEN: ${{ secrets.BOT_TOKEN }}
+
+      - name: Run tests
+        run: mvn test
+        env:
+          MONGO_URL: ${{ secrets.MONGO_URL }}