Dockerfile

FROM eclipse-temurin:17-jdk-alpine as build
WORKDIR /workspace/app

# Copy gradle files
COPY gradlew .
COPY gradle gradle
COPY build.gradle .
COPY settings.gradle .

# Make gradlew executable
RUN chmod +x gradlew

# Cache gradle dependencies
RUN ./gradlew dependencies --no-daemon

# Copy source code
COPY src src

# Build the application
RUN ./gradlew build -x test --no-daemon

# Extract the JAR file
RUN mkdir -p build/extract && \
    (cd build/extract && jar -xf ../libs/*.jar)

# Create runtime image
FROM eclipse-temurin:17-jre-alpine
WORKDIR /app

# Copy files from build stage
COPY --from=build /workspace/app/build/libs/*.jar app.jar

# Create non-root user
RUN addgroup -S spring && adduser -S spring -G spring
USER spring:spring

# Set environment variables
ENV JAVA_OPTS="-Xms256m -Xmx512m"

# Health check
HEALTHCHECK --interval=30s --timeout=3s --retries=3 \
  CMD wget -q --spider http://localhost:8080/actuator/health || exit 1

# Expose port
EXPOSE 8080

# Run the application
ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar app.jar"]