Add branch check to release workflow.

[peterwilsoncc]

Is your enhancement related to a problem? Please describe.

This plugin requires releases be tagged on the non-default branch trunk.

When doing a release, this requires the release manager to change the branch in the drop-down to use trunk rather than develop.

In order to prevent mistakes, it would be good to check that the tag targets the correct branch in the WP.org deploy workflow to ensure that the tag is against trunk. If not the deploy should fail.

The branch containing a tag can be confirmed by running git branch --contains tags/[tag name]

Designs

N/A

Describe alternatives you've considered

N/A

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