I closed the other threads. Any updates regarding this issue (from yourself and others) will remain in this thread.
This issue with the build here is this
You need a space after the = i.e. CI= npm run build
If this is indeed a different issue than your previous thread(s) (I do note the previous thread was local build/development and it appears this is running on Netlify) I am happy to open the previous thread again. As I noted on one thread here the issue is possibly with Netlify CLI so creating an issue on the GitHub repository is possibly the best course of action.