Environments with custom text file

So nice, I discovered the feature as I was about to develop a custom solution around 1Password CLI!

Mounting a file is definitely the best path forward to get people to migrate to proper secrets management for local dev.

Got some issues when used for the `.dev.vars` of a Cloudflare Worker project, but I'd bet that's a bug in `@cloudflare/vite-plugin`.

What would be really awesome is to be able to have arbitrary text file stored securely in 1P and mounted at their destination. While the `.env` format covers most of our uses cases, we do have secrets in other formats like json files and a few other.

• this could be helpful for secrets in code source as well
• this would also help with people wanting to preserve their original .env formatting