Merge pull request #442 from urinaner/feature/425 #27

	name: Build & Push Backend

	on:
	push:
	branches: [ "main" ]
	paths:
	- 'backend/**' # backend 폴더 안이 변경된 경우만 트리거

	jobs:
	build-backend:
	runs-on: ubuntu-latest
	steps:
	# 1) 코드 체크아웃
	- uses: actions/checkout@v4

	# 2) 백엔드 빌드 환경 설정
	- name: Set up JDK 21
	uses: actions/setup-java@v4
	with:
	java-version: '21'
	distribution: 'temurin'

	# 3) 백엔드 설정 파일 생성
	- name: Create backend configuration files
	run: \|
	mkdir -p ./backend/src/main/resources
	cd ./backend/src/main/resources
	echo "${{ secrets.APPLICATION_YML }}" > application.yml

	# 4) Gradle 설정(캐시 포함)
	- name: Set up Gradle
	uses: gradle/actions/setup-gradle@417ae3ccd767c252f5661f1ace9f835f9654f2b5

	# 4) Gradle 빌드 (테스트 제외)
	- name: Build Backend
	run: \|
	cd backend
	chmod +x ./gradlew
	./gradlew build -x test

	# 5) Docker 로그인 & 빌드 & 푸시
	- name: Docker build & push (Backend)
	run: \|
	docker login -u ${{ secrets.DOCKER_USERNAME }} -p ${{ secrets.DOCKER_PASSWORD }}
	cd backend
	docker build -t ${{ secrets.DOCKER_USERNAME }}/backend:latest .
	docker push ${{ secrets.DOCKER_USERNAME }}/backend:latest

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