refactor: unify cache directory

src/main.rs

@@ -20,7 +20,7 @@ async fn main() -> io::Result<()> {
     logging::init_tracing();
 
     // uses create_dir_all to create both .cache and serve inside it in one go
-    util::make_dir(".cache/serve").await?;
+    util::make_dir(&*CACHE_DIR).await?;
 
     let state = AppState::new();
 

src/router/upload.rs

@@ -32,7 +32,7 @@ async fn upload_to_zip(
 ) -> Result<Response, (StatusCode, String)> {
     let cache_name = util::get_random_name(10);
 
-    let archive_path = Path::new(".cache/serve").join(&cache_name);
+    let archive_path = crate::CACHE_DIR.join(&cache_name);
 
     tracing::debug!("Zipping: {:?}", &archive_path);