ci: add INFRAHUB_CUSTOMER3_REPOSITORY to repository-dispatcher

Author: wvandeun

.github/workflows/repository-dispatch.yml

@@ -38,6 +38,7 @@ jobs:
           - "opsmill/infrahub-demo-dc-fabric"
           - "INFRAHUB_CUSTOMER1_REPOSITORY"
           - "INFRAHUB_CUSTOMER2_REPOSITORY"
+          - "INFRAHUB_CUSTOMER3_REPOSITORY"
 
     steps:
       - name: Checkout code