Upload-artifact leads to 503 error

As per https://github.com/actions/upload-artifact

Warning: Be careful when uploading to the same artifact via multiple jobs as artifacts may become corrupted. When uploading a file with an identical name and path in multiple jobs, uploads may fail with 503 errors due to conflicting uploads happening at the same time. Ensure uploads to identical locations to not interfere with each other.

Our current Scala/Java build modifies the file multiple times.