Fixed secret reference

Author: AlexejPenner

.github/workflows/staging_run_complete_llm.yml

@@ -14,7 +14,7 @@ jobs:
     env:
       ZENML_HOST: ${{ secrets.ZENML_PROJECTS_HOST }}
       ZENML_API_KEY: ${{ secrets.ZENML_PROJECTS_API_KEY }}
-      ZENML_PRODUCTION_STACK : 67166d73-a44e-42f9-b67f-011e9afab9b5 # Set this to your staging stack ID
+      ZENML_STAGING_STACK : 67166d73-a44e-42f9-b67f-011e9afab9b5 # Set this to your staging stack ID
       ZENML_GITHUB_SHA: ${{ github.event.pull_request.head.sha }}
       ZENML_GITHUB_URL_PR: ${{ github.event.pull_request._links.html.href }}
       ZENML_DEBUG: true