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/search/indexing/mod.rs

@@ -5,6 +5,7 @@ use std::time::Duration;
 
 use crate::database::PgPool;
 use crate::database::redis::RedisPool;
+use crate::env::ENV;
 use crate::search::{SearchConfig, UploadSearchProject};
 use crate::util::error::Context;
 use ariadne::ids::base62_impl::to_base62;
@@ -43,12 +44,7 @@ pub enum IndexingError {
 const MEILISEARCH_CHUNK_SIZE: usize = 50000; // 10_000_000
 
 fn search_operation_timeout() -> std::time::Duration {
-    let default_ms = 5 * 60 * 1000; // 5 minutes
-    let ms = dotenvy::var("SEARCH_OPERATION_TIMEOUT")
-        .ok()
-        .and_then(|v| v.parse::<u64>().ok())
-        .unwrap_or(default_ms);
-    std::time::Duration::from_millis(ms)
+    std::time::Duration::from_millis(ENV.SEARCH_OPERATION_TIMEOUT)
 }
 
 pub async fn remove_documents(