FROM eclipse-temurin:21-jdk AS builder
WORKDIR /app

# Copy wrapper and POM first — dependency layer is cached separately from source
COPY .mvn .mvn
COPY mvnw pom.xml ./
RUN --mount=type=cache,target=/root/.m2 ./mvnw dependency:go-offline -q

COPY src ./src
RUN --mount=type=cache,target=/root/.m2 ./mvnw clean package -DskipTests -q

FROM eclipse-temurin:21-jre
WORKDIR /app
COPY --from=builder /app/target/*.jar app.jar
EXPOSE 8080
CMD ["java", "-jar", "app.jar"]