build: explain GitHub Actions cache write restrictions - #26062
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Signed-off-by: CrazyMax <1951866+crazy-max@users.noreply.github.com>
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Description
Document GitHub Actions cache write restrictions that can cause cache export to fail after a successful image push, including workflows triggered when a pull request is merged into the default branch. Explain how to restore cache in read-only workflows and populate it from a workflow with write access.
Clarify how
cache-modeoverrides affect access and whyignore-error=truesuppresses export failures without fixing denied writes.Related issues or tickets
closes docker/build-push-action#1571