ci: cache Gradle work during Docker image builds

.dockerignore

@@ -0,0 +1,5 @@
+*
+!Dockerfile
+!build/
+!build/libs/
+!build/libs/app.jar

.github/workflows/ci-pr.yml

@@ -37,21 +37,11 @@ jobs:
           java-version: '25'
           distribution: 'temurin'
 
-      - name: Gradle 의존성 캐싱
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.gradle/caches
-            ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
-          restore-keys: |
-            ${{ runner.os }}-gradle-
-
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4
 
       - name: 프로젝트 빌드
-        run: ./gradlew build
+        run: ./gradlew build --build-cache
 
       - name: 빌드 결과 댓글
         if: always()
@@ -90,24 +80,11 @@ jobs:
           java-version: '25'
           distribution: 'temurin'
 
-      - name: Gradle 의존성 캐싱
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.gradle/caches
-            ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
-          restore-keys: |
-            ${{ runner.os }}-gradle-
-
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4
 
       - name: 프로젝트 빌드
-        env:
-          GOOGLE_OAUTH_CLIENT_ID: ${{ secrets.GOOGLE_OAUTH_CLIENT_ID }}
-          GOOGLE_OAUTH_CLIENT_SECRET: ${{ secrets.GOOGLE_OAUTH_CLIENT_SECRET }}
-        run: ./gradlew build
+        run: ./gradlew build --build-cache
 
       - name: 빌드 결과 댓글
         if: always()
@@ -137,4 +114,4 @@ jobs:
                 issue_number: context.payload.pull_request.number,
                 name: 'ready-to-build'
               });
-            } catch (e) {}
+            } catch (e) {}

.github/workflows/ci-push.yml

@@ -20,21 +20,8 @@ jobs:
           java-version: '25'
           distribution: 'temurin'
 
-      - name: Gradle 의존성 캐싱
-        uses: actions/cache@v4
-        with:
-          path: |
-            ~/.gradle/caches
-            ~/.gradle/wrapper
-          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
-          restore-keys: |
-            ${{ runner.os }}-gradle-
-
       - name: Setup Gradle
         uses: gradle/actions/setup-gradle@v4
 
       - name: 프로젝트 빌드
-        env:
-          GOOGLE_OAUTH_CLIENT_ID: ${{ secrets.GOOGLE_OAUTH_CLIENT_ID }}
-          GOOGLE_OAUTH_CLIENT_SECRET: ${{ secrets.GOOGLE_OAUTH_CLIENT_SECRET }}
-        run: ./gradlew build
+        run: ./gradlew build --build-cache

.github/workflows/release.yml

@@ -64,6 +64,22 @@ jobs:
       - name: Repository 접근
         uses: actions/checkout@v4
 
+      - name: JDK 25 셋팅
+        uses: actions/setup-java@v4
+        with:
+          java-version: '25'
+          distribution: 'temurin'
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v4
+
+      - name: 애플리케이션 JAR 빌드
+        run: |
+          ./gradlew bootJar --no-daemon --build-cache
+          BOOT_JAR=$(find build/libs -maxdepth 1 -type f -name '*.jar' ! -name '*-plain.jar' | head -n 1)
+          test -n "$BOOT_JAR"
+          cp "$BOOT_JAR" build/libs/app.jar
+
       - name: AWS 자격증명 설정
         uses: aws-actions/configure-aws-credentials@v4
         with:
@@ -74,17 +90,19 @@ jobs:
         id: login-ecr
         uses: aws-actions/amazon-ecr-login@v2
 
-      - name: Docker 이미지 빌드 & 푸시
-        env:
-          REGISTRY: ${{ steps.login-ecr.outputs.registry }}
-        run: |
-          IMAGE=$REGISTRY/backend
-          TAG=v${{ needs.calculate-version.outputs.version }}
+      - name: Docker Buildx 설정
+        uses: docker/setup-buildx-action@v3
 
-          docker build -t $IMAGE:$TAG .
-          docker tag $IMAGE:$TAG $IMAGE:latest
-          docker push $IMAGE:$TAG
-          docker push $IMAGE:latest
+      - name: Docker 이미지 빌드 & 푸시
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: |
+            ${{ steps.login-ecr.outputs.registry }}/backend:v${{ needs.calculate-version.outputs.version }}
+            ${{ steps.login-ecr.outputs.registry }}/backend:latest
+          cache-from: type=gha,scope=backend-runtime
+          cache-to: type=gha,scope=backend-runtime,mode=max
 
       - name: 서버 배포
         uses: appleboy/ssh-action@v1.0.3

Dockerfile

@@ -1,21 +1,11 @@
-# ===== 빌드 스테이지 =====
-FROM gradle:jdk25 AS build
-WORKDIR /app
-
-# 의존성 먼저 복사 (캐싱 활용)
-COPY build.gradle.kts settings.gradle.kts ./
-COPY buildSrc ./buildSrc
-COPY gradle ./gradle
-RUN gradle dependencies --no-daemon || true
-
-# 소스 코드 복사 & 빌드
-COPY src ./src
-RUN gradle bootJar --no-daemon
+# syntax=docker/dockerfile:1.7
 
 # ===== 실행 스테이지 =====
 FROM eclipse-temurin:25-jre-alpine
 WORKDIR /app
-COPY --from=build /app/build/libs/*.jar app.jar
+
+ARG JAR_FILE=build/libs/app.jar
+COPY ${JAR_FILE} app.jar
 
 HEALTHCHECK --interval=10s --timeout=5s --start-period=90s --retries=18 \
   CMD wget -q -O /dev/null http://127.0.0.1:8081/actuator/health/readiness || exit 1

gradle.properties

@@ -0,0 +1 @@
+org.gradle.caching=true