Release v5.4.0

Version 5.4.0 (2023-06-09)

• Changes to the Dockerfile since the last init are now detected, and will
  raise an error.
• Add the -c option to cqfd run/release, to pass extra arguments to the
  pre-defined command.
• The host's /etc/ssh directory is now mapped into the container, to pass
  ssh clients running in the container the same configuration as on the host.
  Cqfd historically mapped ~/.ssh into the container for similar reasons. Note
  this feature can be disabled using the CQFD_NO_SSH_CONFIG environment
  variable.
• The flavors= parameter is not required anymore, as extra flavors in the
  config file are automatically detected.
• When in a project sub-directory, try to locate the .cqfd context in parent
  directories automatically.