workflow-dispatch
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Use alternate `ref` default for PRs
When using this action in PRs the default for a github.ref is refs/pull/<pr_number>/merge. Using the current default would get you the following error:
Error: No ref found for: refs/pull/3508/merge - https://docs.github.com/rest/actions/workflows#create-a-workflow-dispatch-event
This PR updates the default to use github.head_ref for PRs (this value is only set for PRs) and otherwise use github.ref.