When building with debug = false css is lost

@kraigb
Static files don't seem to be served when debug = false.

To replicate in vs code + win 10:

  1. Git clone
  2. remove python==3.7 from requirements (wont build otherwise)
  3. Docker build
  4. Docker run locally
  5. Everything fine
  6. Set debug=False
  7. Docker build
  8. Docker run locally
  9. remember to ctrl+f5 refresh page.
    No CSS loading. It seems static files are missing...

I tried pushing to webapp with same result. Am i missing something?