allow config file for entrypoint in docker file

Dockerfile

@@ -23,5 +23,5 @@ RUN ./gradlew --no-daemon installDist
 
 # target is either: ros3rag.placeA oder ros3rag.placeB
 ENV TARGET unspecified
-# ENV CONFIG_FILE ./ros3rag.common/config.yaml
-ENTRYPOINT ["/bin/bash", "-c", "./${TARGET}/build/install/${TARGET}/bin/${TARGET}"]
+ENV CONFIG_FILE unspecified
+ENTRYPOINT ["/bin/bash", "-c", "./${TARGET}/build/install/${TARGET}/bin/${TARGET} ${CONFIG_FILE}"]