Dockerfile

# Multi-stage build for Spring Boot M-Pesa C2B API

# Stage 1: Build the application
FROM maven:3.9-eclipse-temurin-21 AS builder

WORKDIR /app

# Copy pom.xml and download dependencies (cache layer)
COPY pom.xml .
RUN mvn dependency:go-offline -B

# Copy source code and build
COPY src ./src
RUN mvn clean package -DskipTests

# Stage 2: Run the application
FROM eclipse-temurin:21-jre-alpine

WORKDIR /app

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

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

# Expose application port
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=60s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:8080/api/v1/mpesa/c2b/health || exit 1

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