Fix the concurrency label for the add-changelog-snippet
workflow
#42
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Because the workflow triggers on
pull_request_target
rather thanpull_request
,github.ref_name
will be the name of the base branch (i.e., "master", "maint", or "main"), which means that, if multiple PRs with a CHANGELOG-missing label are opened in quick succession, all but one of theadd-changelog-snippet
workflows for the PRs as a group will be cancelled, which is not want we want. We want the cancellation to only kick in if multiple runs are started on the same PR at once (which happens if a PR is created with multiple labels), so the concurrency label should use a string that is specific to the head (source) of the PRs.