For Coder deployments in secure networks, the transfer of files from a local filesystem to a remote Coder workspace is particularly risky. While we're exploring other options to disable file transfer in other editors that do not use scp (code-server, JetBrains, VS Code Desktop), it seems like it should be possible for us to disable scp on our SSH server implimentation.

Product requirements

Should have

• This can be an environment variable when starting the agent. That way, it's still configured per-template or per-environment, which could be useful.

Nice to have

• Show the user a friendly message that scp is disabled. If this is difficult, we can avoid this.