Removes branch-based conditional execution of CI rebase script

[zenmonkeykstop]

Status

Ready for review

Description of Changes

Updates references to defunct master branch in rebase-ci.sh.

Testing

• CI passes

[conorsch]

LGTM. I see you rolled back your change to the i18n tool logic, which is now targeting upstream master, rather than main. @emkll is there any reason to hold off on a change like 10fe54b#diff-5c5e6b7fb4a6fb6bf1ea79d1c651e0fcL269-R269 ? If so, let's update the i18n repo and press on.

@zenmonkeykstop depending on how the i18n repo changes shake out, might be prudent to squash here. No concerns with the core logic changes you're making, they're quite clear.

[conorsch]

is there any reason to hold off on a change like 10fe54b#diff-5c5e6b7fb4a6fb6bf1ea79d1c651e0fcL269-R269 ? If so, let's update the i18n repo and press on.

Just had a mindmeld with @ketudb, and they concluded that the "main" branch needs to be pushed to the "securedrop-i18n" fork, then the change that @zenmonkeykstop reverted will work agan. We don't need to slip that into this PR, so I'm not blocking merge, but would appreciate further input before we declare the branch migration process over and done with.

[zenmonkeykstop]

There isn't actually a main branch on this repo, default is develop and master has effectively been defunct for a while (until the recent docs kerfuffle). Hence the revert.

[conorsch]

@zenmonkeykstop Thanks for clarifying. Seems to me that the i18n script should be branching from develop, then, not from master (or main). Tangential for this PR, so fine to follow up later!