Update test_azure_integration.yaml

Added comment

.github/workflows/test_azure_integration.yaml

@@ -34,6 +34,9 @@ env:
   NO_PROVIDER_CREDENTIALS_azure: false
 
 jobs:
+  # In if statements at the top level of a job, you cannot use env variable as it is not loaded in.
+  # To skip a job based on a env variable, we use another job. This job's purpose is to make a job output.
+  # The job output can be read in at the top level if statement in the env variable's stead.
   check-for-credentials:
     runs-on: ubuntu-latest
     permissions: