refactor(env): new hatsu_env_file option

docs/src/admins/environments.md

@@ -6,6 +6,12 @@ It is required unless it has a suffix (optional).
 
 However, it may exist as a built-in preset (in the source code) or an example preset (in [`.env.example`](https://github.com/importantimport/hatsu/blob/main/.env.example))
 
+## HATSU_ENV_FILE
+
+- default: `/etc/hatsu/.env`
+
+Hatsu will first try to find the dotenv file in the current directory, and if unsuccessful will try to use the path indicated by `HATSU_ENV_FILE`.
+
 ## HATSU_DATABASE_URL
 
 - default: `sqlite::memory:`

src/main.rs

@@ -2,7 +2,7 @@
 #[global_allocator]
 static ALLOC: snmalloc_rs::SnMalloc = snmalloc_rs::SnMalloc;
 
-use std::ops::Deref;
+use std::{env, ops::Deref, path::Path};
 
 use activitypub_federation::config::FederationConfig;
 use hatsu_apub::actors::ApubUser;
@@ -23,7 +23,10 @@ async fn main() -> Result<(), AppError> {
 
     tracing::info!("loading environment variables");
     if dotenvy::dotenv().is_err() {
-        tracing::debug!("no .env file found");
+        let env_file = env::var("HATSU_ENV_FILE").unwrap_or_else(|_| String::from("/etc/hatsu/.dev"));
+        if dotenvy::from_path(Path::new(&env_file)).is_err() {
+            tracing::debug!("no .env file found");
+        }
     }
 
     let env = AppEnv::init()?;