Support the 'target-path:' directive.

templates/shinyproxy-conf.yml.j2

@@ -136,6 +136,8 @@ proxy:
     container-memory-request: {{ app.container_memory_request | default('256m')}}
     container-memory-limit: {{ app.docker_memory | default('2g') }}
     container-cpu-request: {{ app.container_cpu_request | default('1') }}
+    
+    {% if app.target_path is defined %}target-path: {{ app.target_path }}
 
     {% if app.container_cpu_limit is defined %}container-cpu-limit: {{ app.container_cpu_limit }}{% endif %}