ci: add a slack message for docs update

Author: gureckis

.github/workflows/docs-deploy.yml

@@ -60,3 +60,19 @@ jobs:
           remote_port: ${{ secrets.DOCS_DEPLOY_PORT }}
           remote_user: ${{ secrets.DOCS_DEPLOY_USER }}
           remote_key: ${{ secrets.DOCS_DEPLOY_KEY  }}
+
+      # send a notification at the end
+      - name: Send notification to lab slack
+        env:
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+        if: ${{ env.SLACK_WEBHOOK_URL != '' }} # this should only run if SLACK_WEBHOOK exists
+        id: slack
+        uses: slackapi/slack-github-action@v1.25.0
+        with:
+          # This data can be any valid JSON from a previous step in the GitHub Action
+          payload: |
+            { 
+              "github_username": "${{ github.actor }}",
+              "deploy_url": "Docs were updated as https://smile.gureckislab.org/",
+              "github_hash": "https://github.com/${{ steps.dotenv_github.outputs.VITE_GIT_OWNER }}/${{ steps.dotenv_github.outputs.VITE_GIT_REPO_NAME }}/commit/${{ steps.dotenv_github.outputs.VITE_GIT_HASH }}"
+            }