starting CI/CD

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

Dockerfile

@@ -0,0 +1,33 @@
+# 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}/gradle/ ./gradle
+COPY --chown=app ${SERVICE_ROOT}/gradlew ${SERVICE_ROOT}/build.gradle ${SERVICE_ROOT}/settings.gradle ./
+
+# Copy all needed project files to a folder
+COPY --chown=app:app ${SERVICE_ROOT}/src ./src
+
+# Build the production package
+RUN ./gradlew clean build -x test
+
+# 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/build/libs/*-SNAPSHOT.jar /usr/app/app.jar
+
+EXPOSE 8080
+CMD java -jar /usr/app/app.jar