Fix error when attempting to use detached head on existing repo #15
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Currently if you use a detached head repo (or otherwise have weird branch mappings) the build will fail with a
fatal: ref refs/remotes/origin/HEAD is not a symbolic referror when attempting to get the current branch.This is a more robust solution that will leave the repo in a detached head if it's not currently associated with a branch (common in a CI environment) and further no longer assumes the remote branch is called
origin/${branch}and instead asks git for what the tracked remote branch is.