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/v3/projects.rs

@@ -12,6 +12,7 @@ use crate::database::models::{
 use crate::database::redis::RedisPool;
 use crate::database::{self, models as db_models};
 use crate::database::{PgPool, PgTransaction};
+use crate::env::ENV;
 use crate::file_hosting::{FileHost, FileHostPublicity};
 use crate::models;
 use crate::models::ids::{ProjectId, VersionId};
@@ -427,13 +428,13 @@ pub async fn project_edit(
 
         if status.is_searchable()
             && !project_item.inner.webhook_sent
-            && let Ok(webhook_url) = dotenvy::var("PUBLIC_DISCORD_WEBHOOK")
+            && !ENV.PUBLIC_DISCORD_WEBHOOK.is_empty()
         {
             crate::util::webhook::send_discord_webhook(
                 project_item.inner.id.into(),
                 &pool,
                 &redis,
-                webhook_url,
+                &ENV.PUBLIC_DISCORD_WEBHOOK,
                 None,
             )
             .await
@@ -451,18 +452,16 @@ pub async fn project_edit(
             .await?;
         }
 
-        if user.role.is_mod()
-            && let Ok(webhook_url) = dotenvy::var("MODERATION_SLACK_WEBHOOK")
-        {
+        if user.role.is_mod() && !ENV.MODERATION_SLACK_WEBHOOK.is_empty() {
             crate::util::webhook::send_slack_project_webhook(
                     project_item.inner.id.into(),
                     &pool,
                     &redis,
-                    webhook_url,
+                    &ENV.MODERATION_SLACK_WEBHOOK,
                     Some(
                         format!(
                             "*<{}/user/{}|{}>* changed project status from *{}* to *{}*",
-                            dotenvy::var("SITE_URL")?,
+                            ENV.SITE_URL,
                             user.username,
                             user.username,
                             &project_item.inner.status.as_friendly_str(),