Local Environment File Partial Override and Merging

First of all I am very pleased with the announcement of the new environment feature to mount into local .env files!

For our use case it would be beneficial to allow merging different environments into the same .env file or to allow partial overrides of values locally that are persisting locking of the desktop application.

For local development, we have a single starter .env file with a lot of empty values and not all of these values are used by all developers. For example we have an authentication related section that contains secrets that are per-developer. For example the developer specific Github PAT, Social Auth provider App identifiers and credentials. These should be still stored in the single env file that is used during development and we would like to avoid fragmentation into multiple files at the moment, as it complicates our containerized configuration.

So I have two related feature requests:

• Would it be possible to allow merging of different environments into a single mounted file (conflict resolution aside for now)?
• Would it be possible to allow partial overrides of specific values based on the employee vault or local environment?