This is a smart pattern with .dockerignore where it keeps a lot of huge things from getting copied into the context... but it's also so confusing every time you

This is a smart pattern with .dockerignore where it keeps a lot of huge things from getting copied into the context... but it's also so confusing every time your container doesn't have the new file you created. I think you're going to have to allow `app/*` which means you will be checking in some .DS_STORE files anyway.