externalized build number from pipeline as variable BUILD_NUMBER

Dockerfile

@@ -29,6 +29,7 @@ ARG AUSER=appuser
 ARG AGID=137
 ENV USER=$AUSER
 ENV GID=$AGID
+ARG BUILD_NUMBER=
 RUN addgroup -g $GID -S docker
 RUN adduser --no-create-home -u 1000 -G docker -D $USER
 
@@ -40,7 +41,7 @@ RUN mkdir /data && \
 
 VOLUME /data
 
-COPY --chown=1000:$GID target/dta-backend.jar app.jar
+COPY --chown=1000:$GID target/dta-backend-$BUILD_NUMBER.jar app.jar
 
 USER 1000:$GID
 

pom.xml

@@ -10,7 +10,7 @@
 	</parent>
 	<groupId>de.hftstuttgart</groupId>
 	<artifactId>dta-backend</artifactId>
-	<version>${buildNumber}</version>
+	<version>${env.BUILD_NUMBER}</version>
 	<name>dta-backend</name>
 	<description>Dockerized test agent for moodle</description>