FROM eclipse-temurin:21-jdk
WORKDIR /app

# Copy build configuration and wrapper first so this layer caches well.
COPY gradlew settings.gradle build.gradle ./
COPY gradle/ gradle/
RUN chmod +x gradlew

# Copy backend module. The dev compose overlays this with a host bind mount
# for live source changes; if the bind mount is absent (DinD, CI, k8s) the
# image is still self-contained and `gradlew :backend:bootRun` will work.
COPY backend/ backend/

EXPOSE 8080
ENTRYPOINT ["./gradlew", ":backend:bootRun", "--no-daemon"]