add homebrew formula in bucket

What

Add the homebrew formula to the packages bucket and fix a couple of problems.

Notice, this formula is released in a protected bucket.

Why

How

I added a new job to release the homebrew formula.

Manually testing the MR

curl -s -O https://tezos-linux-repo.storage.googleapis.com/homebrew/abate@release_homebrew/Formula/octez.rb
brew install -s octez.rb

Check also if the new Child pipeline homebrew is correct. And the the homebrew pipeline runs in a test release pipeline.

If you have a MacOS based machine it should also work out of the box.

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR