CH-#0: Created github action workflow for the backend

.github/workflows/backend.yml

@@ -0,0 +1,29 @@
+name: Backend CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        working-directory: ./backend
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up JDK 17
+      uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+    - name: Setup Gradle
+      uses: gradle/gradle-build-action@v2
+    - name: Execute Gradle test
+      run: ./gradlew test