[FEAT] CI 설정

.github/workflows/backend-ci.yml

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+# github repository actions 페이지에 나타날 이름
+name: Backend CI
+
+# event trigger
+# main 브랜치에 push, PR이 되었을 때 workflow 실행
+on:
+  push:
+    branches: [ "weekly","develop","main" ]
+    paths : '**'
+  pull_request:
+    branches:  [ "weekly","develop","main" ]
+    paths : '**'
+
+permissions: write-all
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+    # JDK setting : github actions에서 사용할 JDK 설정
+    - name: Set up JDK 17
+      uses: actions/checkout@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+
+    # gradlew에 실행 권한을 부여합니다.
+    - name: Grant execute permisson for gradlew
+      run: chmod +x gradlew
+      shell : bash
+
+    # gradle caching - 빌드 시간 향상
+    - name: Gradle Caching
+      uses: actions/cache@v3
+      with:
+        path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+        key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+        restore-keys: |
+            ${{ runner.os }}-gradle-
+
+  # gradle build
+    - name: Build with Gradle
+      run: ./gradlew build 
+
+    - name: 테스트 결과를 PR에 코멘트로 등록합니다
+      uses: EnricoMi/publish-unit-test-result-action@v1
+      if: always()
+      with:
+        files: '**/build/test-results/test/TEST-*.xml'
+
+    - name: 테스트 실패 시, 실패한 코드 라인에 Check 코멘트를 등록합니다
+      uses: mikepenz/action-junit-report@v3
+      if: always()
+      with:
+        report_paths: '**/build/test-results/test/TEST-*.xml'
+        token: ${{ github.token }}
+
+    - name: build 실패 시 Slack으로 알립니다
+      uses: 8398a7/action-slack@v3
+      with:
+        status: ${{ job.status }}
+        author_name: 백엔드 빌드 실패 알림
+        fields: repo, message, commit, author, action, eventName, ref, workflow, job, took
+      env:
+       SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+      if: failure()