R2 impl (#466)

* Add Cloudflare R2 impl

* Bump actix version

* Fix sec issues

src/util/env.rs

@@ -1,10 +1,10 @@
 use std::str::FromStr;
 
 pub fn parse_var<T: FromStr>(var: &'static str) -> Option<T> {
-    dotenv::var(var).ok().and_then(|i| i.parse().ok())
+    dotenvy::var(var).ok().and_then(|i| i.parse().ok())
 }
 pub fn parse_strings_from_var(var: &'static str) -> Option<Vec<String>> {
-    dotenv::var(var)
+    dotenvy::var(var)
         .ok()
         .and_then(|s| serde_json::from_str::<Vec<String>>(&s).ok())
 }