feat(web, server): Ability to use config file instead of admin UI (#3836)

* implement method to read config file

* getConfig returns config file if present

* return isConfigFile for http requests

* disable elements if config file is used, show message if config file is set, copy existing config to clipboard

* fix allowing partial configuration files

* add new env variable to docs

* fix tests

* minor refactoring, address review

* adapt config type in frontend

* remove unnecessary imports

* move config file reading to system-config repo

* add documentation

* fix code formatting in system settings page

* add validator for config file

* fix formatting in docs

* update generated files

* throw error when trying to update config. e.g. via cli or api

* switch to feature flags for isConfigFile

* refactoring

* refactor: config file

* chore: open api

* feat: always show copy/export buttons

* fix: default flags

* refactor: copy to clipboard

---------

Co-authored-by: Jason Rasmussen <jrasm91@gmail.com>

docs/docs/install/environment-variables.md

@@ -1,3 +1,7 @@
+---
+sidebar_position: 90
+---
+
 # Environment Variables
 
 ## Docker Compose
@@ -22,6 +26,7 @@ These environment variables are used by the `docker-compose.yml` file and do **N
 | `LOG_LEVEL`                 | Log Level (verbose, debug, log, warn, error) |    `log`     | server, microservices                        |
 | `IMMICH_MEDIA_LOCATION`     | Media Location                               |  `./upload`  | server, microservices                        |
 | `PUBLIC_LOGIN_PAGE_MESSAGE` | Public Login Page Message                    |              | web                                          |
+| `IMMICH_CONFIG_FILE`        | Path to config file                          |              | server                                       |
 
 :::tip