Let relbot update A-C on trunk

[jcristau]

We already use relbot for this on fenix release branches and on all
branches for focus-android, so might as well avoid the duplication.

Pull Request checklist

• Tests: This PR includes thorough tests or an explanation of why it does not
• Screenshots: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
• Accessibility: The code in this PR follows accessibility best practices or does not include any user facing features. In addition, it includes a screenshot of a successful accessibility scan to ensure no new defects are added to the product.

QA

• QA Needed

To download an APK when reviewing a PR (after all CI tasks finished running):

1. Click on Checks at the top of the PR page.
2. Click on the firefoxci-taskcluster group on the left to expand all tasks.
3. Click on the build-debug task.
4. Click on View task in Taskcluster in the new DETAILS section.
5. The APK links should be on the right side of the screen, named for each CPU architecture.

GitHub Automation

Used by GitHub Actions.

[rvandermeulen]

😍

[mergify]

This pull request has conflicts when rebasing. Could you fix it @jcristau? 🙏

[JohanLorenzo]

I'm glad to see we're converging towards a single way of bumping A-C. Before merging this PR, there are a few things we need to change in .mergify.yml. If we don't, we will break the autoapproval added in #26148.

If I'm not mistaken, it should be a matter of removing these lines:

fenix/.mergify.yml

Lines 52 to 58 in 1750240

	- or:
	- and:
	- author=mozilla-l10n-automation-bot
	- base=main
	- head=import-l10n
	- status-success=complete-pr
	- and:

and then updating these 2 regexes to take main into account:

fenix/.mergify.yml

Line 8 in 1750240

- base~=^releases[_/].*

fenix/.mergify.yml

Line 60 in 1750240

- base~=^releases[_/].*

[jcristau]

I'm glad to see we're converging towards a single way of bumping A-C. Before merging this PR, there are a few things we need to change in .mergify.yml. If we don't, we will break the autoapproval added in #26148.

Good catch, thank you!

[jcristau]

merged manually due to the mergify config change.