ci: Improve Test-worklows messages (#6290)

* Update test-worklows action

* Improve error messages

* Fix output data to slack

* Fix slackmessage

* add github flag

* add slack config

* Add result to github output

* Fix output string

* Remove old comment for oauth2

* Remove console.logs

* Improve message

* Update to different slack action

* update payload

* Fix wrong json

* debugging

* Revert "update payload"

This reverts commit 4ea955c85e7169e47e62ad6099c4265cda5b5381.

* Reverted to old slack action

* Update slack config

* Remove fallback value

* Change config name

* tests

* more tests

* tests

* Use single message

* message fixes

* Final fixes

* Correct channel

* delete slack.yml config

* keep unused Export credentials step for later

---------

Co-authored-by: Marcus <marcus@n8n.io>

.github/workflows/test-workflows.yml

@@ -69,8 +69,9 @@ jobs:
         shell: bash
 
       - name: Run tests
-        run: n8n/packages/cli/bin/n8n executeBatch --shallow --skipList=test-workflows/skipList.txt --shortOutput --concurrency=16 --compare=test-workflows/snapshots
+        run: n8n/packages/cli/bin/n8n executeBatch --shallow --skipList=test-workflows/skipList.txt --githubWorkflow --shortOutput --concurrency=16 --compare=test-workflows/snapshots
         shell: bash
+        id: tests
         env:
           N8N_ENCRYPTION_KEY: ${{secrets.ENCRYPTION_KEY}}
           SKIP_STATISTICS_EVENTS: true
@@ -98,4 +99,7 @@ jobs:
           status: ${{ job.status }}
           channel: '#updates-build-alerts'
           webhook-url: ${{ secrets.SLACK_WEBHOOK_URL }}
-          message: Test workflows failed (${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})
+          message: |
+            🛑 Workflow test failed 🛑:
+            ${{ steps.tests.outputs.slackMessage}}
+            Sent by *Github Action*: <${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}| Test workflow>