test: display comment on PR if visual integration tests fail #1076
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Description of proposed changes
This adds to @tihuan's work on #1068 which needs to be landed first.
Once #1068 is landed, if someone happens to break screenshot testing in GitHub actions, there's no way to see what happened (this could be a major issue if actions are failing, but local tests are passing).
I've built a GitHub App and service which, once installed on a repository, will comment with screen shots on a PR, if integration tests are broken:
It can be seen in action on a testing repo here.
Related issue(s)
Related to #917
Testing
I've tested thoroughly with the GitHub App installed on a testing repository.
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