Enable prebuilds for the default branch when adding a project for a GitLab or Bitbucket repository

[gtsiolis]

Problem to solve

When adding a GitLab or Bitbucket (#7422) project, a webhook is being added. Prebuilds are by default enabled for the default branch for GitHub repositories. However, prebuilds are not enabled for the default branch until you manually trigger a prebuild using the prefixed URL. See relevant docs[1][2] for GitLab and Bitbucket repositories.

🍊 🍊 🍊 🍊

See relevant comment in #7031 (comment):

Eventually we will most probably need to separate project addition and project configuration steps so that these can be done separastely. 💭

Proposal

To maintain a similar behavior within the product, we could consider enabling prebuilds when adding a repository as proejct without requiring triggering manully the first prebuild.

[AlexTugarev]

Prebuilds are by default enabled for the default branch for GitHub repositories. However, prebuilds are not enabled for the default branch until you manually trigger a prebuild using the prefixed URL.

Quickly checked with the behavior of #7422, and I need to disagree on that. There seems to be no limitation on branches once the webhook events are registered and a config can be fetched from the repository, it starts to prebuild, see ...

[jldec]

Closing as non-reproducible. Please file a new issue with repro steps if you believe this is still a problem. Thanks.