Dockerfile

# Multi-stage build: compile with JDK
FROM eclipse-temurin:21-jdk AS builder

WORKDIR /build

# Copy Gradle wrapper and configuration
COPY gradlew .
COPY gradle gradle
COPY build.gradle.kts .
COPY settings.gradle.kts .

# Copy source code
COPY src src

# Build the application
RUN chmod +x ./gradlew && ./gradlew bootJar --no-daemon

# Runtime stage: minimal JRE image
FROM eclipse-temurin:21-jre-alpine

WORKDIR /app

# Copy JAR from builder stage
COPY --from=builder /build/build/libs/*.jar app.jar

# Create non-root user for security
RUN addgroup -g 1000 appuser && adduser -D -u 1000 -G appuser appuser
USER appuser

# Expose port
EXPOSE 8080

# Health check using Actuator
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD wget --no-verbose --tries=1 --spider http://localhost:8080/actuator/health || exit 1

# Run the application with prod profile
ENTRYPOINT ["java", "-jar", "app.jar", "--spring.profiles.active=prod"]