ci(release): account for detached git repo in CI

Luke Hollindarequested to merge
lh-release-script-to-use-commit-branch-in-ci into master

Grabbing the branch name directly leads to this error in CI:

Error: current branch is HEAD. 
Releases should only be created from the 'master' branch.

The CI git repo is in a detached state and we need to grab the branch name directly from CI_COMMIT_BRANCH

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