A GitHub action to enable auto-merge on a pull request.

⚠️ There are very specific conditions under which this action will work. See Conditions for details.

      - uses: peter-evans/enable-pull-request-automerge@v1
        with:
          token: ${{ secrets.PAT }}
          pull-request-number: 1

This action uses a GitHub API that only works under specific conditions. All of the following conditions must be true for this action to succeed.

1. The target repository must have Allow auto-merge enabled in settings.
2. The pull request base must have a branch protection rule with at least one requirement enabled.
3. The pull request must be in a state where requirements have not yet been satisfied. If the pull request can already be merged, attempting to enable auto-merge will fail.

In the following example create-pull-request action is used to create a pull request containing some changes that we want to merge automatically once requirements have been satisfied.

      - uses: actions/checkout@v2

      # Make changes to pull request here

      - name: Create Pull Request
        id: cpr
        uses: peter-evans/create-pull-request@v3
        with:
          token: ${{ secrets.PAT }}

      - name: Enable Pull Request Automerge
        if: steps.cpr.outputs.pull-request-operation == 'created'
        uses: peter-evans/enable-pull-request-automerge@v1
        with:
          token: ${{ secrets.PAT }}
          pull-request-number: ${{ steps.cpr.outputs.pull-request-number }}
          merge-method: squash

If the "require pull request reviews" branch protection has been enabled we can optionally auto-approve the pull request by adding the following step to the example above. The if condition makes sure we don't approve multiple times if the workflow executes more than once before the pull request merges.

      - name: Auto approve
        if: steps.cpr.outputs.pull-request-operation == 'created'
        uses: juliangruber/approve-pull-request-action@v1
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          number: ${{ steps.cpr.outputs.pull-request-number }}

MIT