Release seems to not have js and css

This is my first time building a release and deploying on docker. When I run my release, the css and js seems off and I get this error

request_id=F0VIxWVGm1vkSdcAAAAC [info] GET /my_app/assets/app-ea41011aaca6a21b837n9a7417bc6234.js
11:07:28.910 request_id=F0VIxWVGm1vkSdcAAAAC [info] Sent 404 in 201µs

This is my prod.exs

config :my_app, MyAppWeb.Endpoint,
url: [host: "localhost", port: 4001, path: "/my_app"],
  cache_static_manifest: "priv/static/cache_manifest.json"

Any help?

Hi @grangerelixx did you run MIX_ENV=prod mix assets.deploy?

yes I did