Look for a "trigger word" in a pull-request description or comment, so that later steps can know whether or not to run.
Your workflow needs to listen to the following events:
on:
pull_request:
types: [opened]
issue_comment:
types: [created]
And then you can use the action in your jobs like this:
jobs:
deploy:
runs-on: ubuntu-latest
steps:
- uses: khan/pull-request-comment-trigger@master
id: check
with:
trigger: '@deploy'
reaction: rocket
env:
GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'
- run: 'echo Found it!'
if: steps.check.outputs.triggered == 'true'
Reaction must be one of the reactions here: https://developer.github.com/v3/reactions/#reaction-types
And if you specify a reaction, you have to provide the GITHUB_TOKEN env vbl.