slack-github-action/example-workflows/Technique_2_Slack_API_Method/author.yml

# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json

name: Direct message the author
on:
  push:
jobs:
  run:
    name: Send a notification of recent changes
    runs-on: ubuntu-latest
    steps:
      - name: Checkout the repo
        uses: actions/checkout@v7
        with:
          persist-credentials: false

      - name: Find correspondences
        id: email
        uses: slackapi/[email protected]
        with:
          method: users.lookupByEmail # https://docs.slack.dev/reference/methods/users.lookupByEmail/
          token: ${{ secrets.SLACK_BOT_TOKEN }}
          payload: |
            email: ${{ github.event.pusher.email }}

      - name: Search email detail
        if: ${{ steps.email.outputs.ok }}
        run: |
          SLACK_USER_ID=$(echo '${{ steps.email.outputs.response }}' | jq -r '.user.id')
          echo "SLACK_USER_ID=$SLACK_USER_ID" >> $GITHUB_ENV

      - name: Send a direct message
        if: ${{ steps.email.outputs.ok }}
        uses: slackapi/[email protected]
        with:
          errors: true
          method: chat.postMessage # https://docs.slack.dev/reference/methods/chat.postMessage/
          token: ${{ secrets.SLACK_BOT_TOKEN }}
          payload: |
            "channel": "${{ env.SLACK_USER_ID }}",
            "text": "${{ github.repository }} had a change!",
            "blocks": [
              {
                "type": "section",
                "text": {
                  "type": "mrkdwn",
                  "text": ":large_green_square: <https://github.com/${{ github.repository }}|*${{ github.repository }}*>: `${{ github.sha }}`"
                }
              },
              {
                "type": "section",
                "text": {
                  "type": "mrkdwn",
                  "text": ${{ toJSON(github.event.head_commit.message) }}
                }
              }
            ]