Do not allow prebuilds when GitHub app is not configured or GitLab webhook is removed

[gtsiolis]

Problem to solve

When a user removes or reconfigures the Github app, removes the GitLab webhook, or is removed from a project, you can still trigger a prebuild from the dashboard.

For GitHub, the prebuild go through the RUNNING and SUCCESS states with no error.

For GitLab, the prebuild go through the RUNNING and SUCCESS states with the following error:

last backup failed: workspace does not exist. Please contact support if you need the workspace data.

Proposal

Do not allow prebuilds when GitHub app is not configured or GitLab webhook is removed

[jldec]

thanks! 🙏 @gtsiolis

• It would indeed be nice to handle the missing webhook/app config with an indicator as suggested as in Show prebuild configuration state on the project prebuilds page  #7010
• But, I don't think we should prevent manually triggered prebuilds in this case - Allowing users to work without the automation seems reasonable to me.
• I could not reproduce the GitLab error which you mentioned probably because I'm not following the same steps that you did - would you mind opening a separate issue with more details for reproducing so that we can investigate the cause of this bug?