Improve environment variable handling and reading (#5389)

* wip: better env var reading

* move most env vars to env.rs

* migrate more env vars

* more migration

* more migrations

* More migration

* 🦀 dotenvy is gone (almost)

* 🦀 dotenvy is gone 🦀

* Fix mural source account env var handling

* Remove defaults from admin key vars

* dummy commit to update github pr

* fix ci

apps/labrinth/src/routes/mod.rs

@@ -1,8 +1,8 @@
 use crate::database::models::DelphiReportIssueDetailsId;
+use crate::env::ENV;
 use crate::file_hosting::FileHostingError;
 use crate::routes::analytics::{page_view_ingest, playtime_ingest};
 use crate::util::cors::default_cors;
-use crate::util::env::parse_strings_from_var;
 use actix_cors::Cors;
 use actix_files::Files;
 use actix_web::http::StatusCode;
@@ -40,10 +40,7 @@ pub fn root_config(cfg: &mut web::ServiceConfig) {
             .wrap(
                 Cors::default()
                     .allowed_origin_fn(|origin, _req_head| {
-                        let allowed_origins =
-                            parse_strings_from_var("ANALYTICS_ALLOWED_ORIGINS")
-                                .unwrap_or_default();
-
+                        let allowed_origins = &ENV.ANALYTICS_ALLOWED_ORIGINS;
                         allowed_origins.contains(&"*".to_string())
                             || allowed_origins.contains(
                                 &origin