[Containers] update example using the repo's latest code

[digizeph]

Summary

Update the example code using the example repo's code: https://github.com/mikenomitch/cron-container/blob/main/src/index.ts

The updated example includes more features like override of onStart and onStop of containers, and uses the container.start syntax.

Screenshots (optional)

Documentation checklist

• The change adheres to the documentation style guide.

[mikenomitch]

Approved, but I'd fix the comment!

[digizeph]

Hi @haleycode, could you take a look and see if we can merge this? Thanks!

[github-actions]

Hey there, we've marked this pull request as stale because there's no recent activity on it. This label is helps us identify PRs that might need updates (or to be closed out by our team if no longer relevant).