Alert slack if tile-generator docker build fails.
Alert slack if tile-generator docker build fails.

alex-slynko/tile-generator,cf-platform-eng/tile-generator,cf-platform-eng/tile-generator,alex-slynko/tile-generator,alex-slynko/tile-generator,cf-platform-eng/tile-generator,cf-platform-eng/tile-generator,alex-slynko/tile-generator