trivial implementation to test cloud run

Signed-off-by: Peter Siegmund <developer@mars3142.org>

Dockerfile

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+# Stage that builds the application, a prerequisite for the running stage
+FROM eclipse-temurin:21-jdk-jammy as build
+
+ARG SERVICE_ROOT
+
+RUN apt-get update -qq
+
+# Stop running as root at this point
+RUN useradd -m app
+WORKDIR /usr/src/app/
+RUN chown app:app /usr/src/app/
+USER app
+
+# Copy pom.xml and prefetch dependencies so a repeated build can continue from the next step with existing dependencies
+COPY --chown=app ${SERVICE_ROOT}/.mvn/ .mvn
+COPY --chown=app ${SERVICE_ROOT}/mvnw ${SERVICE_ROOT}/pom.xml ./
+
+# Copy all needed project files to a folder
+COPY --chown=app:app ${SERVICE_ROOT}/src ./src
+
+# Build the production package
+RUN ./mvnw --batch-mode clean verify -DskipTests
+
+# Running stage: the part that is used for running the application
+FROM eclipse-temurin:21-jre-jammy
+
+RUN useradd -m app
+USER app
+
+COPY --chown=app --from=build /usr/src/app/target/*.jar /usr/app/app.jar
+
+EXPOSE 8080
+CMD java -jar /usr/app/app.jar