Add GHES support

[frequ]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

Currently automerging dependabot PRs does not work in GitHub Enterprise Server environment.
You'll get error from dependabot/fetch-metadata@v1.

Warning: Dependabot's commit signature is not verified, refusing to proceed.
Error: PR is not from Dependabot, nothing to do.

I believe this could be easily solved just by passing skip-commit-verification to dependabot/fetch-metadata@v1 (https://github.com/dependabot/fetch-metadata) action.

I'd propose adding new input skip-commit-verification and then passing it to dependabot/fetch-metadata@v1.

Motivation

Support for GHES.

Example

steps:
  - name: Automerge GHES dependabot PR
    uses: fastify/github-action-merge-dependabot@v3
    with:
      skip-commit-verification: true

[simoneb]

Thanks for this! Unfortunately we don't have a GHES subscription so we can't easily test this. It seems like a fairly simple change, would you like to send a PR for this?

[github-actions]

🎉 This issue has been resolved in version 3.6.0 🎉

The release is available on:

• GitHub release

Your optic bot 📦🚀

[frequ]

Still not quite working – works for dependabot/fetch-metadata action now, but still not internally. Made a fix PR

[github-actions]

🎉 This issue has been resolved in version 3.6.1 🎉

The release is available on:

• GitHub release

Your optic bot 📦🚀