[Solution] Error: brew cask is no longer a brew command

% brew cask install docker

Error: `brew cask` is no longer a `brew` command. 
Use `brew  --cask` instead.

Reason for the error:

The syntax brew cask <command> has been deprecated since Homebrew 2.6.0 and disabled since 2.7.0. This has been replace by in favor of brew <command> --cask

Read more: https://github.com/Homebrew/discussions/discussions/340#discussioncomment-232364

Solution:

brew <command> --cask

Example:

% brew install docker --cask
Running `brew update --auto-update`...

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