Adjust validate workflow to pass missing token

Author: tidoust

files/workflows/validate-session.yml

@@ -71,3 +71,7 @@ jobs:
           # project and public_repo scope.
           GRAPHQL_TOKEN: ${{ secrets.GRAPHQL_TOKEN }}
           GH_TOKEN: ${{ secrets.GRAPHQL_TOKEN }}
+
+          # Information about the authentication token for the calendar
+          # endpoint. The token must obviously be stored as a secret!
+          W3C_TOKEN: ${{ secrets.W3C_TOKEN }}