Dockerfile

# Multi-stage build for BFlow Backend Application

# Stage 1: Build stage
FROM maven:3.9-eclipse-temurin-21-alpine AS build

WORKDIR /app

# Copy Maven files for dependency caching
COPY pom.xml .
COPY mvnw .
COPY .mvn .mvn

# Download dependencies (this layer will be cached if pom.xml doesn't change)
RUN mvn dependency:go-offline -B

# Copy source code
COPY src ./src

# Build the application
RUN mvn clean package -DskipTests -B

# Stage 2: Runtime stage
FROM eclipse-temurin:21-jre-alpine

WORKDIR /app

# Create a non-root user for security
RUN addgroup -S spring && adduser -S spring -G spring

# Copy the built JAR from build stage
COPY --from=build /app/target/*.jar app.jar

# Change ownership to non-root user
RUN chown spring:spring app.jar

# Switch to non-root user
USER spring:spring

# Expose the application port
EXPOSE 8080

# Run the application
ENTRYPOINT ["java", "-jar", "/app/app.jar"]