Also allow "refs" in the PR description

Author: koppor

.github/workflows/on-pr-opened-updated.yml

@@ -42,7 +42,7 @@ jobs:
           titleRegex: '^#(?<ticketNumber>\d+)'
           branchRegex: '^(?<ticketNumber>\d+)'
           # Matches GitHub's closes/fixes/resolves #{number}, but does not match our example `Closes #12345` in PULL_REQUEST_TEMPLATE
-          bodyRegex: '(?<action>fixes|closes|resolves)\s+(?:https?:\/\/github\.com\/JabRef\/jabref\/issues\/)?#?(?<ticketNumber>(?!12345\b)\d+)'
+          bodyRegex: '(?<action>fixes|closes|resolves|refs)\s+(?:https?:\/\/github\.com\/JabRef\/jabref\/issues\/)?#?(?<ticketNumber>(?!12345\b)\d+)'
           bodyRegexFlags: 'i'
           outputOnly: true
       - run: echo "${{ steps.get_issue_number.outputs.ticketNumber }}"