Implement slash command on GitHub Actions

name: "Slash command"
on:
  issue_comment:
    types: [created]

jobs:
  slash-command:
    if: github.event_name == 'issue_comment' &&
        startsWith(github.event.comment.body, '/my-slash-command')
    runs-on: ubuntu-20.04
    env:
      REPO: ${{ github.repository }}
      ISSUE_NUMBER: ${{ github.event.issue.number }}
      COMMENT_ID: ${{ github.event.comment.id }}
      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
    steps:
    - name: Add eyes reaction
      run: |
        gh api \
        --method POST \
        -H "Accept: application/vnd.github+json" \
        -H "X-GitHub-Api-Version: 2022-11-28" \
        /repos/$REPO/issues/comments/$COMMENT_ID/reactions \
        -f content='eyes'        
    - uses: actions/checkout@v3
    - name: Do something
      run: |
                # implement something
    - name: Add rocket reaction
      run: |
        gh api \
        --method POST \
        -H "Accept: application/vnd.github+json" \
        -H "X-GitHub-Api-Version: 2022-11-28" \
        /repos/$REPO/issues/comments/$COMMENT_ID/reactions \
        -f content='rocket'