Dockerfile warning

[MattyTheHacker]

Line:
CMD bundle exec jekyll serve --host 0.0.0.0 --port 4000 --destination /tmp/_site

causes the following warning:

JSONArgsRecommended: JSON arguments recommended for CMD to prevent unintended behavior related to OS signals

[Bros112]

I don't quite have the knowledge to resolve this issue through testing, and as such I do not feel confident to attempt to fix myself, however I feel like I can help by providing results of my (short) research.
From what I have gathered, this warning references the fact that, in this case, it would be better to include the argumants in a json form like this:
CMD ["bundle", "exec", "jekyll", "serve", "--host", "0.0.0.0", "--port", "4000", "--destination", "/tmp/_site"]
(Don't blindly trust this fix, it may be incorrect)

The current form is called the "Shell" form (i.e. something which would be written in a shell).
This reccomended form is the "Exec" form and is preferred.

"When you use shell form, the executable runs as a child process to a shell, which doesn't pass signals. This means that the program running in the container can't detect OS signals like SIGTERM and SIGKILL and respond to them correctly."[1]

Source:
JSONArgsRecommended | Docker Docs