Docker hugo serves a website but does not load a theme

I am using this image to build my website in a server. I gave the baseurl in config and dockerfile. I am using this image


I commented out the exposed port because, in my running server, I will specify this. Then when I run the docker, I see that still using the port as it says that Web Server is available at https://myurl.com:1313/ (bind address 0.0.0.0). Therefore, it can not see the js and css files and I see the website without anytheme. I use the hugo-theme-techdoc.

Current Hugo version is 0.68.3
The hugo-theme-techdoc works with Hugo 0.66.0 and newer.

I changed the version to

ENV HUGO_VERSION 0.68.2
still the same result. I posted my docker file here: https://stackoverflow.com/questions/60838148/docker-hugo-does-not-load-a-theme