ci: Don’t run pipeline after merging a MR

Merged Philip Withnall requested to merge disable-post-merge-ci into main

MRs are already tested in CI before merge, so it’s redundant and a waste of resources to test them again after merge.

In the rare case where something breaks post-merge (perhaps because several MRs have been tested individually and merged, but interact with each other badly), that’ll be caught in the weekly scheduled CI run.

YAML inspiration from

Signed-off-by: Philip Withnall

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