Switch back to using heroku/procfile
from the builder in tests
#713
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The
heroku/builder:22
builder image will now only ever contain one version of theheroku/procfile
CNB, after:heroku/buildpacks-jvm#608
heroku/buildpacks-nodejs#696
As such, we no longer need to use a manual Docker Hub URL to avoid the "multiple versions of this buildpack exist in the builder image" error, and instead can use the Procfile CNB directly from the builder image.
This does mean the version is now unpinned, however, it's unlikely to cause test failures in practice, and at least we'll be testing the version of procfile actually used in the builder image (for things like the container starting tests).
GUS-W-14445053.