fix

.github/workflows/notify.yaml

@@ -7,7 +7,7 @@ on:
         required: true
         type: string
     secrets:
-      MM_WEBHOOK_URL:
+      webhook:
         required: true
     	
 jobs:
@@ -16,7 +16,7 @@ jobs:
     steps:
       - uses: mattermost/action-mattermost-notify@master
         with:
-          MATTERMOST_WEBHOOK_URL: ${{ secrets.MM_WEBHOOK_URL }}
+          MATTERMOST_WEBHOOK_URL: ${{ secrets.webhook }}
           PAYLOAD: |
             { 
               "text": "${{ github.repository }} [Pipeline](${{ github.server_url }}/${{ inputs.repository }}/actions/runs/${{ github.run_number }}) was success :white_check_mark:"