Release v1.4.0

• Fix SCTP NG Shutdown issue
• Fix 100% CPU consumption issue
• Fix RAN UE ID display
• Fix issue for TMSI and GUTI value
• Fix for handling S-NSSAI
• Remove OPC value from AMF configuration
• Support for Ubuntu 20.04 bare-metal installation
• Official images produced by CI are pushed to oaisoftwarealliance Docker-Hub Team account
• Reduce image size