add build args option

docker_build.py

@@ -87,6 +87,11 @@
         help="add dev feature to generated image [default: %(default)s]",
         action='store_true',
     )
+    parser.add_argument(
+        '--build-arg',
+        help="add dev feature to generated image [default: %(default)s]",
+        default=None,
+    )
     # TODO (maybe) add argument for other build arg
 
     # TODO detect that user is member of docker group
@@ -143,7 +148,7 @@
     signal.signal(signal.SIGTERM, signal_handler)
 
     # TODO docker build
-    buildargs = {}
+    buildargs = nmspc.build_arg
     dockerfile = 'Dockerfile'
     if dev:
         debug_dockerfile = 'Dockerfile.debug'