fails to explain docker's command to add repo

[bermudi]

echo \
  "deb [arch="$(dpkg --print-architecture)" signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  "$(. /etc/os-release && echo "$VERSION_CODENAME")" stable" | \
  sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

PARSING ERROR! unexpected token ')' (position 45) . /etc/os-release && echo "$VERSION_CODENAME")" stable"