Add a no-build option to fig up, to save time when services were already freshly built.

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

fig/cli/main.py

@@ -425,6 +425,7 @@ class TopLevelCommand(Command):
             --no-color            Produce monochrome output.
             --no-deps             Don't start linked services.
             --no-recreate         If containers already exist, don't recreate them.
+            --no-build            Don't build an image, even if it's missing
         """
         insecure_registry = options['--allow-insecure-ssl']
         detached = options['-d']
@@ -440,7 +441,8 @@ class TopLevelCommand(Command):
             start_links=start_links,
             recreate=recreate,
             insecure_registry=insecure_registry,
-            detach=options['-d']
+            detach=options['-d'],
+            do_build=not options['--no-build'],
         )
 
         to_attach = [c for s in project.get_services(service_names) for c in s.containers()]