Fetch all branches in CI

[wojtek-coreum]

Description

By default, checkout action fetches only the current branch. But to run backward compatibility check on proto files, master is needed too.

Reviewers checklist:

• Try to write more meaningful comments with clear actions to be taken.
• Nit-picking should be unblocking. Focus on core issues.

Authors checklist

• Provide a concise and meaningful description
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This change is 

[ysv]

Reviewed 1 of 1 files at r1, all commit messages.
Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dzmitryhil, @miladz68, and @wojtek-coreum)

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.github/workflows/ci.yml line 71 at r1 (raw file):

        uses: actions/checkout@v3
        with:
          fetch-depth: 0 # needed for proto backward compatibility check

does it literarily mean to fetch all branches existing inside repo ?

does it influence CI time a lot ?
Is there an option to just fetch PR branch and master ?

[wojtek-coreum]

Reviewable status: all files reviewed, 1 unresolved discussion (waiting on @dzmitryhil, @miladz68, and @ysv)

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.github/workflows/ci.yml line 71 at r1 (raw file):

Previously, ysv (Yaroslav Savchuk) wrote…

does it literarily mean to fetch all branches existing inside repo ?

does it influence CI time a lot ?
Is there an option to just fetch PR branch and master ?

Yes, it fetches entire repo. I don't know how it affects the timeout. But I see in this PR that it doesn't solve the problem anyway, I don't know why? (linter is failing)