automerge.yml

name: Automerge

env:
    MERGE_METHOD: 'squash'
    MERGE_RETRY_SLEEP: 300000
    # MERGE_ERROR_FAIL: Set this to "true" to have the action exit with error code 1
    # when the pull request could not be merged successfully during a run.
    MERGE_ERROR_FAIL: true

on:
    pull_request:
        types:
            - labeled
            - unlabeled
            - synchronize
            - opened
            - edited
            - ready_for_review
            - reopened
            - unlocked
    check_suite:
        types:
            - completed
    status: {}

jobs:
    automerge:
        name: Automerge if requested
        runs-on: ubuntu-24.04
        env:
            IS_POSTHOG_BOT_AVAILABLE: ${{ secrets.POSTHOG_BOT_GITHUB_TOKEN != '' }}
        steps:
            # must have an id so subsequent steps can use the output
            - id: automergeStep
              name: Automerge
              if: env.IS_POSTHOG_BOT_AVAILABLE == 'true'
              uses: pascalgn/automerge-action@d1203c0bf94a827b991e5de69d662e9163304fa0 # v0.16.3
              env:
                  GITHUB_TOKEN: ${{ secrets.POSTHOG_BOT_GITHUB_TOKEN }}

            # the automerge documentation claims it adds these outputs but we don't get them
            # maybe because it was a fake PR 🤷
            - name: Print Automerge Outputs as JSON
              if: ${{ always() }}
              run: |
                  echo "For future debugging... the Automerge Outputs are:"
                  if [[ "${{ steps.automergeStep.outputs.mergeResult }}" != "" ]]; then
                      echo '{"mergeResult": "${{ steps.automergeStep.outputs.mergeResult }}", "pullRequestNumber": "${{ steps.automergeStep.outputs.pullRequestNumber }}"}' | jq .
                  else
                      echo "No outputs from Automerge action."
                  fi

            # a CDP destination is setup to alert when we get this event
            - name: Send Automerge Event to PostHog
              if: ${{ failure() }}
              uses: PostHog/posthog-github-action@v0.1
              with:
                  posthog-token: '${{ secrets.POSTHOG_API_TOKEN }}'
                  event: 'posthog-github-automerge-pr-status'
                  properties: >-
                      {
                        "prUrl": "${{ github.event.pull_request.html_url }}",
                        "jobStatus": "${{ job.status }}",
                        "prTitle": "${{ github.event.pull_request.title }}",
                        "prNumber": "${{ github.event.pull_request.number }}",
                        "prState": "${{ github.event.pull_request.mergeable_state }}",
                        "mergeResult": "${{ steps.automergeStep.outputs.mergeResult }}",
                        "pullRequestNumber": "${{ steps.automergeStep.outputs.pullRequestNumber }}",
                        "automergeOutcome": "${{ steps.automergeStep.outcome }}"
                      }