refactor: make Authelia user management scalable

- Remove envsubst complexity for password hashes
- Keep users_database.yml only on server (not in git)
- Add users_database.yml to .gitignore
- Update users_database.template.yml with multi-user examples
- Configure Authelia to watch users_database.yml for changes
- Users can now be added/removed by editing the file on server
- Supports unlimited users without code changes

net/compose.yaml

@@ -275,13 +275,9 @@ services:
       AUTHELIA_JWT_SECRET: ${AUTHELIA_JWT_SECRET}
       AUTHELIA_SESSION_SECRET: ${AUTHELIA_SESSION_SECRET}
       AUTHELIA_STORAGE_ENCRYPTION_KEY: ${AUTHELIA_STORAGE_ENCRYPTION_KEY}
-      AUTHELIA_USER_PASSWORD_HASH: ${AUTHELIA_USER_PASSWORD_HASH}
     volumes:
       - authelia_config:/config
       - ./authelia:/etc/authelia:ro
-    command: >
-      sh -c "envsubst < /etc/authelia/users_database.template.yml > /config/users_database.yml &&
-             authelia --config /etc/authelia/configuration.yml"
     networks:
       - compose_network
     labels: