Fix scheduled upgrade workflow

Author: m-bull

.github/workflows/schedule-upgrade.yml

@@ -10,12 +10,17 @@ on:
   # Run weekly on a Thursday at 6am
   schedule:
     - cron: "0 6 * * 4"
+  # Allow manual executions
+  workflow_dispatch:
 
 jobs:
   test_upgrade:
     runs-on: ubuntu-latest
     if: github.repository == 'azimuth-cloud/azimuth-config'
     steps:
+      - name: Checkout
+        uses: actions/checkout@v5
+
       - name: Find latest tagged release
         id: get-tag
         run: >-
@@ -33,7 +38,7 @@ jobs:
         uses: slackapi/slack-github-action@v2.1.1
         with:
           webhook: "${{ secrets.SLACK_WEBHOOK_URL }}"
-          webhook-type: incoming-webook
+          webhook-type: incoming-webhook
           payload: |
             text: ":siren: Scheduled Azimuth upgrade test failed\n"${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}""
         if: ${{ failure() }}