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/util/captcha.rs

@@ -1,5 +1,5 @@
+use crate::env::ENV;
 use crate::routes::ApiError;
-use crate::util::env::parse_var;
 use actix_web::HttpRequest;
 use serde::Deserialize;
 use std::collections::HashMap;
@@ -8,7 +8,7 @@ pub async fn check_hcaptcha(
     req: &HttpRequest,
     challenge: &str,
 ) -> Result<bool, ApiError> {
-    let secret = dotenvy::var("HCAPTCHA_SECRET")?;
+    let secret = &ENV.HCAPTCHA_SECRET;
 
     if secret.is_empty() || secret == "none" {
         tracing::info!("hCaptcha secret not set, skipping check");
@@ -16,7 +16,7 @@ pub async fn check_hcaptcha(
     }
 
     let conn_info = req.connection_info().clone();
-    let ip_addr = if parse_var("CLOUDFLARE_INTEGRATION").unwrap_or(false) {
+    let ip_addr = if ENV.CLOUDFLARE_INTEGRATION {
         if let Some(header) = req.headers().get("CF-Connecting-IP") {
             header.to_str().ok()
         } else {
@@ -38,7 +38,7 @@ pub async fn check_hcaptcha(
     let mut form = HashMap::new();
 
     form.insert("response", challenge);
-    form.insert("secret", &*secret);
+    form.insert("secret", secret);
     form.insert("remoteip", ip_addr);
 
     let val: Response = client