Dockerfile

# Multi-stage build for Spring Boot application
FROM gradle:8.5-jdk17 AS builder

WORKDIR /app
COPY build.gradle settings.gradle ./
COPY gradle gradle
COPY gradlew ./

# Download dependencies (this layer will be cached)
RUN ./gradlew --no-daemon dependencies

# Copy source code and build
COPY src src
RUN ./gradlew --no-daemon build -x test

# Runtime stage
FROM eclipse-temurin:17-jre-alpine

# Add a non-root user
RUN addgroup -g 1001 appuser && adduser -D -u 1001 -G appuser appuser

WORKDIR /app

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

# Change ownership to appuser
RUN chown appuser:appuser app.jar

# Switch to non-root user
USER appuser

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

EXPOSE 8080

ENTRYPOINT ["java", "-jar", "app.jar"]