Change ubuntu version from latest to 22.04 in Dockerfile_builder to handle issue where the Medley-online docker image was failing to find the lastest versions of libc and libm when loading maiko

Author: fghalasz

.github/workflows/Dockerfile_builder

@@ -8,7 +8,7 @@
 #
 # ******************************************************************************
 
-FROM ubuntu:latest
+FROM ubuntu:22.04
 SHELL ["/bin/bash", "-c"]
 USER root:root
 # Install build tools