added secrets to drone

.drone.yml

@@ -20,6 +20,11 @@ steps:
     commands:
       - terraform -chdir=infrastructure init
       - terraform -chdir=infrastructure plan
+    environment:
+      tf_virtual_environment_endpoint:
+        from_secret: virtual_environment_endpoint
+      tf_virtual_environment_api_token:
+        from_secret: virtual_environment_api_token
     # when:
     #   event:
     #   - pull_request