refactor: rename images

erpnext-assets - ERPNext nginx config + static assets
erpnext-worker - ERPNext python environment
frappe-assets - Frappe nginx config + static assets
frappe-worker - Frappe python environment
frappe-socketio - Frappe socketio process common for apps

build/frappe-worker/commands/background.py

@@ -0,0 +1,7 @@
+import frappe
+from frappe.utils.scheduler import start_scheduler
+
+print("Starting background scheduler . . .")
+start_scheduler()
+
+exit(0)