Fetch base and search merge-base without creating local branch #75
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This PR fixes issue mentioned in #74 (comment)
Previous version didn't work if there was a full repository clone (e.g. actions/checkout@v2 with fetch-depth: 0) but base branch was tracked only as remote.
Now it doesn't matter if base is tracked locally. All checks uses
remotes/origin/${base}
instead.In any case full fetching with
git fetch
no longer uses--unshallow
argument which caused failure if repository was not shallow.