added install of son-cli's to dockerfile
added install of son-cli's to dockerfile

CN-UPB/upb-son-editor-backend,chrz89/upb-son-editor-backend,chrz89/upb-son-editor-backend,Jmanuel4SandMan/upb-son-editor-backend,chrz89/upb-son-editor-backend,CN-UPB/upb-son-editor-backend,Jmanuel4SandMan/upb-son-editor-backend,Jmanuel4SandMan/upb-son-editor-backend