[feature] Allow the eXist-db sub-application to be parameterise via Docker (still defaults to Jetty)

Author: adamretter

exist-docker/src/main/resources-filtered/Dockerfile

@@ -98,4 +98,5 @@ HEALTHCHECK CMD [ "java", \
     "--xpath", "system:get-version()" ]
 
 ENTRYPOINT [ "java", \
-    "org.exist.start.Main", "jetty" ]
+    "org.exist.start.Main"]
+CMD ["jetty" ]