Add docker gradle plugin defunct declaration

[xRuiAlves]

Before this PR

There's no info on the repo stating that the docker plugin is no longer supported and should no longer be used.

After this PR

==COMMIT_MSG==
The docker plugin is declared as defunct.
==COMMIT_MSG==

Possible downsides?

[changelog-app]

Generate changelog in changelog/@unreleased

Type
See change types. Select one:

• Feature
• Improvement
• Fix
• Break
• Deprecation
• Manual task
• Migration

Description

The docker plugin is declared as defunct.

Check the box to generate changelog(s)

• Generate changelog entry

[tpetracca]

Do expect folks to still use docker-compose and docker-run plugins and have them work? Or is real goal that this entire repo is dead? CC @CRogers

[xRuiAlves]

Cool, thanks @carterkozak! 👍

[xRuiAlves]

Oops, had forgotten about this one! Un-assigning myself :)

[CRogers]

👍

[chkpnt]

Regarding

It is no longer used internally at Palantir.

What do you use instead these days and can you recommend what you are using?