Per-deployment type environment variables

### What problem are you trying to solve?

Whenever adding environment variables they are added to Production & Development deploys. Which is usually what you do not want when making your applications.

### Describe the solution you'd like

Adding a tab-like menu to the environment variable editor to select which type of deploys they apply to.

### Describe alternatives you've considered

None.

### Documentation, Adoption, Migration Strategy

Adding a tab-like menu to the environment variable editor to select which type of deploys they apply to.

Another suggestion could be a command for managing environment variables like:
```bash
deployctl env (project-name/id) (deploy-type, Dev / Prod) (varname) (varvalue)
```