add support for running the server on local network in debug

app/run.py

@@ -1,10 +1,15 @@
 from app import create_app
 import os
+import sys
 
 app = create_app()
 
 if __name__ == "__main__":
+    if len(sys.argv) > 1 and sys.argv[1] == '-d':
+        hostname = '0.0.0.0'
+    else:
+        hostname = '127.0.0.1'
     app.run(
-        host = "127.0.0.1",
+        host = hostname,
         port = 8080
     )