Chore: 멀티 스테이지 적용 (빌드 / 실행)

Author: lunarbae628

.github/workflows/ci.yml

@@ -37,15 +37,15 @@ jobs:
             echo "No Gradle project found"; exit 1
           fi
 
-      - name: Build & Test
+      - name: Test
         env:
           MAIL_PASSWORD: ${{ secrets.CI_MAIL_PASSWORD }}
           MAIL_USERNAME: ${{ secrets.CI_MAIL_USERNAME }}
           MONGO_URI: ${{ secrets.CI_MONGO_URI }}
         run: |
           cd "${{ steps.detect.outputs.dir }}"
           chmod +x ./gradlew || true
-          ./gradlew clean test bootJar
+          ./gradlew clean test --no-daemon
 
       - name: Find Dockerfile
         id: df

infra/backend/Dockerfile

@@ -1,16 +1,29 @@
+# ---- Build Stage ----
+FROM eclipse-temurin:21-jdk-alpine AS builder
+
+WORKDIR /workspace
+
+COPY gradlew ./gradlew
+COPY gradle ./gradle
+COPY build.gradle* settings.gradle* ./
+RUN chmod +x ./gradlew
+
+RUN ./gradlew --no-daemon dependencies || true
+
+COPY . .
+
+RUN ./gradlew clean bootJar -x test --no-daemon
+
+# ---- Runtime Stage ----
 FROM eclipse-temurin:21-jre-alpine
 
 RUN addgroup -S app && adduser -S app -G app
 RUN apk add --no-cache wget
 
 WORKDIR /app
 
-COPY --chown=app:app app.jar /app/app.jar
+COPY --from=builder --chown=app:app /workspace/build/libs/*.jar /app/app.jar
 
-#ENV JAVA_OPTS="-Xms256m -Xmx512m" \
-#    SERVER_PORT=8080 \
-#    TZ=Asia/Seoul
- 
 ENV JAVA_OPTS="-XX:MaxRAMPercentage=75 -XX:+UseG1GC -Duser.timezone=Asia/Seoul" 
 
 EXPOSE 8080