make attic better

overlay/attic/concurrent-32.patch

@@ -0,0 +1,13 @@
+diff --git a/server/src/config.rs b/server/src/config.rs
+index 4412cbf..6dd483a 100644
+--- a/server/src/config.rs
++++ b/server/src/config.rs
+@@ -565,7 +565,7 @@ fn default_default_retention_period() -> Duration {
+ }
+ 
+ fn default_concurrent_chunk_uploads() -> usize {
+-    10
++    32
+ }
+ 
+ fn load_config_from_path(path: &Path) -> Result<Config> {

overlay/attic/default.nix

@@ -16,6 +16,9 @@ final: prev: {
             cargoLock = null;
             cargoHash = "sha256-AbpWnYfBMrR6oOfy2LkQvIPYsClCWE89bJav+iHTtLM=";
             useFetchCargoVendor = true;
+            patches = [
+              ./concurrent-32.patch
+            ];
           }
         );
     };