starlight: build on PR & fix CI deploy error #21789
Merged
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Contribution description
With #21787 I accidentally discovered that the "test doc" CI script never ran on PRs, only on pushes. This caused a small error that only occurs on fresh installs (alias the CI) to slip through where the folder structure didn't exist yet.
I changed the workflows to now make a bit more sense. The test build only gets run on PRs (instead of only on pushes to master) and does not get executed when pushing to master (given that deploy docs already counts as a build test)
Testing procedure
Issues/PRs references