chore: harden Dependabot auto-merge - #155
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Summary
pull_request_targetdependabot/fetch-metadataaction from v2.3.0 to v3.1.0Context
The review of #148 raised a concern about write permissions on Dependabot-triggered workflows. The existing workflow has operated successfully because this repository allows workflows to request write permissions: its logs show both approval and auto-merge succeeding for eligible updates.
This follow-up adopts the safer trusted-base event recommended for metadata-only automation. The workflow does not check out, download, or execute pull request code. It also moves the metadata action to its Node 24 runtime and removes the current Node 20 deprecation warning.
The repository guard remains intentional so a fork or copied workflow does not inherit privileged auto-merge behavior.
Validation
actionlint .github/workflows/dependabot-auto-merge.ymlReferences
pull_request_targetdependabot/fetch-metadatav3.1.0