feat : ci/cd를 위한 workflows

.github/workflows/gradle.yml

@@ -0,0 +1,50 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will build a Java project with Gradle and cache/restore any dependencies to improve the workflow execution time
+# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-java-with-gradle
+
+name: Java CI with Gradle
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+permissions:
+  contents: read
+
+jobs:
+  build-docker-image:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+    # 1. Java 17 세팅
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+
+    # 2. Spring Boot 애플리케이션 빌드
+
+    - name: Build with Gradle
+      uses: gradle/gradle-build-action@67421db6bd0bf253fb4bd25b31ebb98943c375e1
+      with:
+        arguments: clean bootJar
+
+    # 3. Docker 이미지 빌드
+    - name: docker image build
+      run: docker build -t ${{ secrets.DOCKERHUB_USERNAME }}/github-actions-demo. 
+
+   # 4. DockerHub 로그인
+    - name: docker login
+      uses: docker/login-action@v2
+      with:
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_PASSWORD }}
+
+  # 5. Docker Hub 이미지 푸시
+    - name: docker Hub push
+      run: docker push ${{ secrets.DOCKERHUB_USERNAME }}/github-actions-demo