Hiya @kwiat1990 and sorry to be slow to get back to you!
While our main site build debugging advice is around syncing versions of node/packages and making sure you build with a clean repo, and can be found here:
I wonder based on that error message - are you sure that the file is in ./ during build? Might be worth trying out our “run the build environment locally” to see if you can detect the problem in a local shell that you can examine rather than diagnosing only from the failure logs: