[BUG] Don't get the comment with preview url on PR merged

[masterbd]

Action config

on:
  push:
    branches: [master]
    ...
    - uses: FirebaseExtended/action-hosting-deploy@v0
      with:
        repoToken: "${{ secrets.GITHUB_TOKEN }}"
        firebaseServiceAccount: "${{ secrets.FIREBASE_SERVICE_ACCOUNT }}"
        projectId: ***
        expires: 14d
        channelID: preview

Error message

N/A

Expected behavior

To post the comment with preview url.

Actual behavior

I don't get any comment with preview url for PR merged configuration.

[peterfortuin]

I have the same issue. See #108