cicd: main 브랜치에 대한 CI 파이프라인 설정

- main 브랜치에 푸시 및 PR 시 CI가 트리거되도록 설정
- 빌드, 테스트 및 실패 시 알림및 PR close 설정

Author: 7zrv

.github/workflows/CI.yml

@@ -0,0 +1,74 @@
+name: CI Pipeline
+
+on:
+  push:
+    branches:
+      [ main ]
+  pull_request:
+    branches:
+      [ main ]
+    types:
+      [opened, synchronize, reopened]
+
+jobs:
+  Continuous-Integration:
+    runs-on: ubuntu-latest
+
+    env:
+      DB_URL: ${{ secrets.DB_URL }}
+      DB_USERNAME: ${{ secrets.DB_USERNAME }}
+      DB_PASSWORD: ${{ secrets.DB_PASSWORD }}
+
+    steps:
+      - name: Github Repository 파일 불러오기
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: JDK 21 버전 설치
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: 21
+
+      - name: Gradle 캐싱
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.gradle/caches
+            ~/.gradle/wrapper
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: |
+            ${{ runner.os }}-gradle-
+
+      - name: 빌드 권한 부여
+        run: chmod +x ./gradlew
+        shell: bash
+
+    
+      - name: 빌드 및 테스트
+        run: ./gradlew build
+
+
+      - name: Close PR, if build fail
+        if: ${{ failure() }}
+        uses: actions/github-script@v6
+        with: # actions(uses)의 파라미터 역할
+          github-token: ${{ github.TOKEN }}
+          script: | 
+            const pull_number = ${{ github.event.pull_request.number }}
+            const updated_title = `[BUILD FAIL] ${{ github.event.pull_request.title }}`
+            await github.rest.pulls.createReview({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: pull_number,
+              body: '빌드에 실패했습니다.',
+              event: 'REQUEST_CHANGES'
+            })
+            await github.rest.pulls.update({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              pull_number: pull_number,
+              title: updated_title,
+              state: 'closed'
+            })