- Remove dependency build. For normal use cases on a
  recent distro, installing all dependencies from distro
  should be fine. Tested on Ubuntu 20.04 (mbedTLS too old,
  otherwise okay) and Ubuntu 22.04.
- Document more dependencies. With the added dependencies a
  clean build and ctest run is possible starting with the
  default ubuntu:<version> containers.
- Use ninja. We use this for all of our non-VC builds, so
  recommend it here as well.

Based on a smaller change proposed in Github#301
by Scruel Tao.

Signed-off-by: Frank Lichtenheld <frank@lichtenheld.com>