Dotenv file parameter type

[jahvon]

Add support for loading environment variables from dotenv (.env) files as a new parameter type in executable configurations. This would extend the existing params system to include envFile alongside text, secretRef, and prompt.

New Parameter Type: envFile

executables:
  - name: start-server
    exec:
      params:
        - envFile: .env
        - secretRef: api-key
          envKey: API_KEY
        - text: "development"
          envKey: NODE_ENV
      cmd: npm start

Parameter Type Definition

params:
  - envFile: path/to/file.env    # Load all variables from file
  # OR with explicit envKey mapping
  - envFile: .env
     envKey: DATABASE_URL         # Load only DATABASE_URL from .env

[jahvon]

This should include adding a dotenv file to a workspace's config for sharing across all executables