Remove dotnet

Build/CI/install-env.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
-echo "Dotnet is $(whereis dotnet) and PATH is $PATH"
+apt remove --purge dotnet*
+apt remove --purge aspnetcore*
 
 wget https://dot.net/v1/dotnet-install.sh -O dotnet-install.sh