fix: use vars for ovh endpoint

Author: gary-van-woerkens

.github/workflows/list_ovh_instances.yaml

@@ -22,12 +22,12 @@ jobs:
 
       - name: Check OVH_ENDPOINT and OVH_SERVICE_NAME
         run: |
-          echo "OVH_ENDPOINT: ${{ secrets.OVH_ENDPOINT }}"
+          echo "OVH_ENDPOINT: ${{ vars.OVH_ENDPOINT }}"
           echo "OVH_SERVICE_NAME: ${{ secrets.OVH_SERVICE_NAME }}"
 
       - name: Run OVH API script
         env:
-          OVH_ENDPOINT: ${{ secrets.OVH_ENDPOINT }}
+          OVH_ENDPOINT: ${{ vars.OVH_ENDPOINT }}
           OVH_APPLICATION_KEY: ${{ secrets.OVH_APPLICATION_KEY }}
           OVH_APPLICATION_SECRET: ${{ secrets.OVH_APPLICATION_SECRET }}
           OVH_CONSUMER_KEY: ${{ secrets.OVH_CONSUMER_KEY }}