get branch commit belongs to

[adelowo]

This allows us to get the branch a commit belongs to.

If commit oooo is on master and a_feature_branch, it defaults to master as the result. I have gone through GitHub's implementation and it is the same. Here is an example, go-gitea/gitea@7cb1d82 exists on master and release/v1.7 but it defaults to showing master

Needed to fix go-gitea/gitea#5473

[codecov-io]

Codecov Report

Merging #142 into master will increase coverage by 0.05%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   33.71%   33.76%   +0.05%     
==========================================
  Files          28       28              
  Lines        1827     1833       +6     
==========================================
+ Hits          616      619       +3     
- Misses       1132     1134       +2     
- Partials       79       80       +1

Impacted Files	Coverage Δ
commit.go	10.94% <ø> (ø)	⬆️
repo_commit.go	25.28% <50%> (+0.57%)	⬆️

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[lunny]

Why not we give more than one branch? Maybe it's better than github and almost have the same performance.