Git commit message as oneline about notify-slack-action

[ndench]

Great, thanks for the tip @ravgeetdhillon. For anyone else looking for this, I've managed to get it working with the following.
NOTE: I'm triggering the workflow using the workflow_run event, not pull_request.

            - name: Get commit message
              if: always()
              id: commit
              run: |
                  echo ::set-output name=message::$(echo "${{ github.event.workflow_run.head_commit.message }}" | head -n 1)
            - name: Send slack notification
              uses: ravsamhq/notify-slack-action@v2
              if: always()
              with:
                  message_format: '{emoji} ${{ steps.commit.message }}'
                  token: ${{ secrets.GITHUB_TOKEN }}
              env:
                  SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}

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[ravgeetdhillon]

@ndench These are some of the functions that are available in GitHub Actions but I don't think there is one that can help you solve your problem.

You can write a bash script to get the first line of the commit message ${{ github.event.head_commit.message }}, store it in a variable and then reference it in the notify-slack action message.

[ravgeetdhillon]

@ndench Thanks for adding your advice for other users.