environment = "shared"

[evetjo]

When deploying to networks account, the environment variable should be set to "shared". Currently, the only options are dev, test, preprod and prod. In my opinion, none of these values are valid for the central resources created in networks account, because these resources (tgw, ipam, network firewall etc) are used by every environment.

My suggestion is to add "shared" as an extra option to the environment variable, and to use that as the default value when when deploying to networks account:
environment = "shared" # dev, test, preprod, prod, shared