Fix GHA when opam-rt uses a diverging API #6336
Merged
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Backported to 2.3 in #6337
Currently our Github Action script uses either opam-rt's master branch or a branch with the same name as the source branch. Obviously when a change to opam-rt is required between master and a backport branch such as 2.3, master becomes only available for opam master and the backport PRs will start failing.
This PR fixes this by simply looking up if the name of the target branch is available in the opam-rt repository and use that instead.