Add subdomain support

Author: kennyadsl

source.yml

@@ -114,7 +114,7 @@ jobs:
           name: Build Docker Image On Docker Server
           command: |
             source $CIRCLE_BUILD_NUM
-            ssh << parameters.user >>@<< parameters.server >> "cd $DIRECTORY && << parameters.fetch_seed_data_command >> && docker build -t $CONTAINER --file=<< parameters.dockerfile >> ."
+            ssh << parameters.user >>@<< parameters.server >> "cd $DIRECTORY && << parameters.fetch_seed_data_command >> && docker build -t $CONTAINER --build-arg SUBDOMAIN=$SUBDOMAIN --file=<< parameters.dockerfile >> ."
       - run:
           name: Run Docker Container On Docker Server
           command: |