Bundle docker image as a Whalebrew package

[Danta1st]

Description

It's like homebrew, but docker

https://github.com/whalebrew/whalebrew

Discussion in #605

[DannyBen]

I believe this is already done, without the need to do anything.
Nevertheless, I added this:

https://github.com/DannyBen/bashly/blob/cdf17b677c631e9ad54b65ae3b59fea056de8d8d/Dockerfile#L3

If a more experienced Whalebrew user can confirm that this works like other packages, it would be appreciated.

[DannyBen]

I am closing this as done.

• Added the minimal (seems to be optional) whalebrew label to the docker image
• Added installation instructions to the Installation > Docker section.

If anybody sees a problem with using whalebrew to install bashly, let me know.