[r3.2] test workflows: user input sanitisation (addendum) (#17299)

Author: mriccobene

.github/workflows/backups-dashboards.yml

@@ -30,9 +30,11 @@ jobs:
     environment: dashboards_backups
     steps:    
     - name: Pull backup script from ${{ inputs.TEMPLATE_BRANCH}} branch
+      env:
+        TEMPLATE_BRANCH: ${{ inputs.TEMPLATE_BRANCH }}
       run: |
         set +x
-        curl -L -H "Authorization: Bearer ${{ secrets.GH_TOKEN }}" -H "Accept: application/vnd.github.v3.raw" -H "X-GitHub-Api-Version: 2022-11-28" https://api.github.com/repos/erigontech/scripts/contents/dashboards/dashboard-backup.sh?ref=${{ inputs.TEMPLATE_BRANCH}} -o /tmp/dashboard-backup
+        curl -L -H "Authorization: Bearer ${{ secrets.GH_TOKEN }}" -H "Accept: application/vnd.github.v3.raw" -H "X-GitHub-Api-Version: 2022-11-28" https://api.github.com/repos/erigontech/scripts/contents/dashboards/dashboard-backup.sh?ref=${TEMPLATE_BRANCH} -o /tmp/dashboard-backup
     
     - name: Upload dashboard-backup
       uses: actions/upload-artifact@v4