Push failed: failed to read buildpack metadata: (): mapping values are not allowed in this context at line 2 column 36
Please try pushing again.
This means there is a bug in the bin/release script of the buildpack.
remote: -----> Failed to detect set buildpack https://codon-buildpacks.s3.amazonaws.com/buildpacks/heroku/java.tgz
remote: More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
The means the buildpack's bin/detect exited with a non-zero code.