Fix error message shown when image repository metadata is missing #169
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As of #88 the metadata is now under
image.repository
notdocker.repository
, however, the error message still referenced the old location.This caused confusion in when debugging heroku/buildpacks-jvm#60: https://github.com/heroku/buildpacks-jvm/actions/runs/6626786735/job/18000413851#step:10:10
In addition to fixing the error message, I've renamed the enum variants and variables to match the new name.
Lastly, I've updated the README to match the more concise release metadata style now used by all of our buildpacks (the repository URL is also a real example, to make it clearer that the URL shouldn't include the
docker://
prefix).Fixes #168.
GUS-W-14355165.