Default helm install uses a broken code storage

[nicoloboschi]

If you install langstream using helm, it defaults to the default code storage "noop". That implementation is a mock, mostly used by tests.

It's even worse that it "seems" to work accepting the app zip but then when the zip is retrieved, it returns an empty zip!

LangStream needs s3/azureBS to work. on the other side, we want to let people quickly installing it.

Since MinIO dev installation writes to the node storage directly, we could make the default implementation to write file locally and mount a volume bound to the node fs.

[eolivelli]

This is another user who saw this problem as well https://github.com/LangStream/langstream/issues/695