comment on test template equal to final config

Signed-off-by: Kiara Grouwstra <kiara@procolix.eu>

deployment/check/data-model-tf-proxmox/setups/template.nix

@@ -62,6 +62,7 @@ in
         type = env.resource-mapping.output-type;
         default = env.deployment {
           deployment-name = "default";
+          # normally our template is distinct, but our test cannot download build deps due to sandboxing
           configuration = config."example-configuration";
         };
       };