Replace inline setup-env, notify-failure, and quality-checks steps in
ci.yml, post-merge.yml, and build-images.yml with composite action
references. Also fix pre-existing make workflow-dryrun failure by
using env context instead of vars/secrets in container.credentials
(act_runner dry-run does not populate vars/secrets contexts).
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
