Docker compose almost working

back/Dockerfile

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+# temp container to build using gradle
+FROM gradle:8.10.2-jdk21 AS TEMP_BUILD_IMAGE
+ENV APP_HOME=/usr/app/
+WORKDIR $APP_HOME
+COPY build.gradle settings.gradle $APP_HOME
+
+COPY gradle $APP_HOME/gradle
+COPY --chown=gradle:gradle . /home/gradle/src
+USER root
+RUN chown -R gradle /home/gradle/src
+
+RUN gradle build || return 0
+COPY . .
+RUN gradle clean build
+
+# actual container
+FROM eclipse-temurin:21-jdk
+ENV ARTIFACT_NAME=unluckiest-1.0.0.jar
+ENV APP_HOME=/usr/app/
+
+WORKDIR $APP_HOME
+COPY --from=TEMP_BUILD_IMAGE $APP_HOME/build/libs/$ARTIFACT_NAME .
+
+EXPOSE 8000
+ENTRYPOINT exec java -jar ${ARTIFACT_NAME}