How to remove a git branch in a dist-git repository

Historically we did not allow to remove git branches in dist-git repository, but FESCo recently approved their removal if and only if all the commits in the branch to be deleted can be reached from another branch. This is a requirement to ensure that if any of the commits were used in a build, we still have the commit accessible and thus we are able to reproduce the build if needed.

There is a script in the releng repository to use to check if a branch can safely be deleted.

So here are the steps to follow to remove the branch <branch> from the package <foo>.

Clone the releng repo if you do not already have it:
```
git clone https://pagure.io/releng.git
```

Pull the latest changes:

pushd releng && git pull --rebase && popd

Clone the <foo> package locally:
```
fedpkg clone <foo>
```
Checkout the <branch> branch:
```
cd clone && git checkout <branch>
```

Run the script:

python ../releng/scripts_new/packages/distgit/distgit_branch_unused.py <branch>

(If needed, see the --help of the script for more information)

If the script returns that the branch is safe to delete:
1. Go to pkgs01 as root
  ssh pkgs01.rdu3.fedoraproject.org
2. Go to the git repository:
  cd /srv/git/repositories/<namespace>/<foo>.git
3. Move the head of the branch (this allows to recover it later if needed):
  mv refs/heads/<branch> heads_<branch>
  
  Sometimes the ref is in the packed-refs file, in that case:
  
  grep <branch> packed-refs > heads_<branch>
  
  Then remove the line from packed-refs file

On your local clone of <foo>, check that the branch was deleted upstream:

git fetch -p

This should show something like:

$ git fetch -p
From ssh://pkgs.fedoraproject.org/<namespace>/<foo>
- [deleted]         (none)     -> origin/<branch>

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