Deploying from the CLI still replaces production secrets.

[Huijiro]

I have my envs all on the .env, I don't have a .local.env (probably should), using agentuity deploy completely rewrites and pushes envs from my .env to the enviroments.

We probably should:

• Prompt the user for confirmation for the rewrite.
• Or just upsert, only insert new values and not rewrite any production values.

[linear]

AGENT-1447