Please, format your post next time as described in the folowing topic:
I fixed your post, because the forum changed your link and I didn’t understand the error message.
I sill don’t understand the topic title: “SSL certificate problem on Docker but not using Curl”
Where did you use curl? Did you actually create a Dev Environment in Docker Desktop and cloned the above mentioned repository into that environment? I don’t see how a certificate in the mingw64 directory on your Windows would help.
Please, provide more details about what you did before you got the error message, because the repository is pretty old, although, it does not do much.
If a certificate is missing in the development environment, I would only install the “ca-certificates” package, but I doubt that would be necessary, because when you create the development environment, you can configure your Git repository and I don’t think GitHub is not supported.