[Fix] Docker 이미지 빌드 방식 개선

.dockerignore

@@ -2,7 +2,10 @@
 .github
 .gradle
 .idea
-build
+build/*
+!build/libs
+build/libs/*
+!build/libs/*.jar
 out
 *.iml
 *.iws

.github/workflows/ci.yml

@@ -44,5 +44,18 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "21"
+          cache: gradle
+
+      - name: Grant Gradle permission
+        run: chmod +x ./gradlew
+
+      - name: Build application jar
+        run: ./gradlew --no-daemon clean bootJar -x test
+
       - name: Build Docker image
         run: docker build -t jobdri-api:${{ github.sha }} .

.github/workflows/deploy.yml

@@ -22,6 +22,19 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "21"
+          cache: gradle
+
+      - name: Grant Gradle permission
+        run: chmod +x ./gradlew
+
+      - name: Build application jar
+        run: ./gradlew --no-daemon clean bootJar -x test
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 

Dockerfile

@@ -1,21 +1,10 @@
-FROM eclipse-temurin:21-jdk-alpine AS builder
-
-WORKDIR /workspace
-
-COPY gradlew settings.gradle build.gradle ./
-COPY gradle ./gradle
-RUN chmod +x gradlew
-
-COPY src ./src
-RUN ./gradlew --no-daemon clean bootJar -x test
-
 FROM eclipse-temurin:21-jre-alpine
 
 WORKDIR /app
 
 RUN addgroup -S jobdri && adduser -S jobdri -G jobdri
 
-COPY --from=builder /workspace/build/libs/*.jar app.jar
+COPY build/libs/*.jar app.jar
 
 USER jobdri