I’m afraid you need to add docker command to your PATH manually. It can be done through profile file. As ZSH is now a default shell on MacOS, it would go to ~/.zprofile file:
# Add Visual Studio Code (code)
export PATH="$PATH:/Applications/Visual Studio Code.app/Contents/Resources/app/bin"
# Add Docker Desktop for Mac (docker)
export PATH="$PATH:/Applications/Docker.app/Contents/Resources/bin/"