Run CI jobs for PRs targeting any branch

[vlad-ivanov-name]

Stack:

• Run CI jobs for PRs targeting any branch #1018 ⬅
• Refactor: use a sum type instead of a bool to indicate need for auth #1016
• Check for blocked repos in SSH RPC #1015
• Make auth optional in make_meta_config #1014
• Check if repo is blocked before checking auth #1013
• SSH support, part 1 #1012

⚠️ Part of a stack created by spr. Do not merge manually using the UI - doing so may have unexpected results.

[vlad-ivanov-name]

Closing pull request: commit has gone away