Dockerfile and heroku.yml added

3 jobs for master in 25 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Compile
passed compile #496086

00:00:06

 
  Test
passed test #496087

00:00:06

 
  Deploy
failed deploy #496088

00:00:12

 
Name Stage Failure
failed
deploy Deploy
=== Fetching app code..

=!= There were problems parsing your heroku.yml. We've detected the following issues:

in body must be of type object: "null"
No stash entries found.
deploy failed
Cleaning up file based variables
ERROR: Job failed: exit status 1