Improvement: Disallow pushing "latest" from master branch in CI

Description

A “nice to have”; not strictly necessary for us to do.

If someone triggers an update of “latest” from master, it should do nothing. That’s because master will always be an unreleased or “non-stable” version.

Environment

None

Assignee

Unassigned

Reporter

Chris "Daz" Darroch

Labels

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Changelog entry text

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Needs Doc

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Priority

Trivial
Configure