I have the same issue.

I’m creating actions these days.

tyankatsu0105/convert-mention-action#1

But I can’t find a solution to the trigger for PR comment. 

I found this page. https://developer.github.com/v3/guides/working-with-comments/#pull-request-comments

According to this page, PR comments use issues API.

I tried adding issue_comment on on.

But not working…

OK.

I understand.

PR message’s eventName is issue_comment.

So you can check Mention Slack jobs’s log in here.

https://github.com/tyankatsu0105/message-to-slack-from-github/commit/9a72de4917a22696b0ece5cd6ca9c11cfc2d21c8/checks?check_suite_id=334701535

Having the same issue.  I’ve created a small workflow that just prints the comment but it never fires when I comment on the pull request containing this workflow.  Even tried covering all the bases for the different events but no joy.

Do we somehow have to register the workflow to fire on PR comments some other way?

name: terraform-staging-apply
on:

issue_comment:

types: [created, edited]

pull_request_review_comment:

types: [created, edited]

pull_request_review:

types: [submitted, edited, dismissed]

issues:

types: [opened, closed]
jobs:

terraform-apply:

name: Terraform Apply

runs-on: ubuntu-latest
steps:
  - uses: actions/checkout@1.0.0
    with:
      submodules: 'true'
      token: ${{ secrets.PAT }} # Needed for private submodules

  - uses: actions/github-script@0.2.0
    with:
      github-token: ${{github.token}}
      script: |
        const body = context.payload.pull_request.body.toLowerCase()
        console.log("Detected comment: " + body)