Failed to trigger Koji build with no relevant error message

[lbarcziova]

When a Koji build fails to be triggered, user is not really informed about the cause of the failure:

• dashboard example
• issue example

[majamassarini]

For the context, I had triggered the Packit exception with this PR https://github.com/packit/ogr/pull/852 I have created the PR to play with the command line and build in-koji a scratch build (this was successful). I was testing scratch builds as a way to "trigger" Koschei and I have broken the ogr code on purpose to get a reverse dependency build failure on Koschei.

[lbarcziova]

The same happens also for Bodhi updates, e.g. https://dashboard.packit.dev/jobs/bodhi/1692. We should have the needed error in the DB in model.data["error"] for both of the jobs.

TODO:

• [x] expose the error via API
• [x] show it on dashboard
• [x] include it also in the created issue

[lbarcziova]

I didn't mean to close this yet, the service part is done, and I will create followup PR for dashboard.