Could not write the .env file — check that the app folder is writable
/api/install/env returned 500 when writing .env failed.
Why this happens
App process lacks write permission to the application directory, disk full, or path is read-only (common on misconfigured containers/hosts). Not a member account error.
Diagnose and fix
1. Ensure the app user can write the install directory (and .env path).
2. Check disk space and mount options (no ro root for the app data path).
3. Retry the installer env save step.
4. Prefer your deployment’s documented env injection if the filesystem must stay read-only.