Added build instructions and alternative multi-stage Dockerfile.

Dockerfile

@@ -2,21 +2,21 @@
 #
 # SPDX-License-Identifier: Apache-2.0
 
-FROM azul/zulu-openjdk-alpine:17
+FROM eclipse-temurin:17-jre-alpine
 
-RUN apk add --update \
-    curl \
-    && rm -rf /var/cache/apk/*
+RUN apk add --update  \
+  curl  \
+  && rm -rf /var/cache/apk/*
 
-RUN addgroup --gid 1000 jumper && adduser --uid 1000 -G jumper -D jumper --no-create-home
+RUN addgroup -g 1000 -S app
+RUN adduser -u 1000 -D -H -S -G app app
 
 USER 1000:1000
 
 EXPOSE 8080 8082
 
-COPY target/*.jar /usr/share/jumper.jar
+COPY target/*.jar /usr/share/app.jar
 
 WORKDIR /usr/share/
 
-CMD java $JVM_OPTS -jar /usr/share/jumper.jar
-
+CMD java $JVM_OPTS -jar /usr/share/app.jar

Dockerfile.multi-stage

@@ -0,0 +1,30 @@
+# SPDX-FileCopyrightText: 2023 Deutsche Telekom AG
+#
+# SPDX-License-Identifier: Apache-2.0
+
+FROM maven:3.9-eclipse-temurin-17-alpine AS build
+RUN mkdir -p /usr/app
+WORKDIR /usr/app
+ADD . /usr/app
+
+RUN mvn -f /usr/app/pom.xml clean package
+
+
+FROM eclipse-temurin:17-jre-alpine
+
+RUN apk add --update  \
+  curl  \
+  && rm -rf /var/cache/apk/*
+
+RUN addgroup -g 1000 -S app
+RUN adduser -u 1000 -D -H -S -G app app
+
+USER 1000:1000
+
+EXPOSE 8080 8082
+
+COPY --from=build /usr/app/target/*.jar /usr/share/app.jar
+
+WORKDIR /usr/share/
+
+CMD java $JVM_OPTS -jar /usr/share/app.jar

README.md

@@ -33,6 +33,36 @@ By participating in this project, you agree to abide by its [Code of Conduct](./
 This project follows the [REUSE standard for software licensing](https://reuse.software/).
 Each file contains copyright and license information, and license texts can be found in the [./LICENSES](./LICENSES) folder. For more information visit https://reuse.software/.
 
+## Building
+
+### Packaging the application
+
+This project is built with [Maven](https://maven.apache.org/). It is validated to be compatible with version 3.9.x. To build the project, run:
+
+```bash
+  ./mvnw clean package
+```
+
+This will build the project and run all tests. The resulting artifacts will be placed in the `target` directory.
+
+### Building the Docker image
+
+The project contains a Dockerfile that can be used to build a Docker image. To build the image, run:
+
+```bash
+  docker build --platform linux/amd64 -t jumper.
+```
+
+This will build the image and tag it as `jumper:latest`.
+
+### Multi-stage Docker build
+
+Alternatively, you can use the multi-stage Docker build to build the image. This will build the application in a Maven container and then copy the resulting artifacts into a smaller container. To build the image, run:
+
+```bash
+  docker build --platform linux/amd64 -t jumper -f Dockerfile.multi-stage .
+```
+
 ## Scenarios
 Scenarios from various aspects of Jumper functionality perspective. <b>Scenarios from different perspective can be overlapping!</b>