Docker build "Can't add file used by another process"
My recent attempt to put an older .NET Framework app inside a container also hit another snag. Embarassingly for me, if I'd read the actual error it would've been a quick fix. Unfortunately I got caught up with a previous docker vs anti-virus issue and went down a rabbit hole I hope others can avoid.
In my case it was Visual Studio locking a ".dbml" file of a database project. If you get a error with "can't add file...The process cannot access the file because it us being used by another process", save yourself sometime and read the first part of the error.