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/file_hosting/mod.rs

@@ -1,3 +1,5 @@
+use std::str::FromStr;
+
 use async_trait::async_trait;
 use thiserror::Error;
 
@@ -63,3 +65,25 @@ pub trait FileHost {
         file_publicity: FileHostPublicity,
     ) -> Result<DeleteFileData, FileHostingError>;
 }
+
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+pub enum FileHostKind {
+    S3,
+    Local,
+}
+
+#[derive(Debug, Error)]
+#[error("invalid file host kind")]
+pub struct InvalidFileHostKind;
+
+impl FromStr for FileHostKind {
+    type Err = InvalidFileHostKind;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        Ok(match s {
+            "s3" => Self::S3,
+            "local" => Self::Local,
+            _ => return Err(InvalidFileHostKind),
+        })
+    }
+}