Signed-off-by: red-hat-konflux <[email protected]>

This change updates the Dockerfile for Konflux in a few ways:

- Use a minimal UBI image for the operator to reduce overall dependencies
- Remove subscription manager since Konflux has this in place already
  and we don't need to specify it directly
- Set an appropriate WORKDIR when building images so copies work
  correctly from the builder image
- Set a default USER_UID in the user_setup script
- Fix output path in copy commands to point to the correct operator
  binary
- Add some vertical spacing in Dockerfile to better readability