Environment variables can't be unset for agent_runtime deployments #60

What happened?

Once an env var is set, it can't be removed. Only updated

Steps to Reproduce

1. Set a var in .env
2. Deploy the agent
3. Remove the var in .env
4. Redeploy the agent

What did you expect to happen?

The env var is not set anymore

Client information

Command Output / Logs

No response

Anything else we need to know?

The culprit is that the cli always includes the variables from previous deployments.