Add bash completion for --platform

[albers]

This adds bash completion for #474.
The completion is only added when commands are run against a daemon running in experimental mode.

[codecov-io]

Codecov Report

Merging #704 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #704      +/-   ##
==========================================
- Coverage   51.81%   51.81%   -0.01%     
==========================================
  Files         218      218              
  Lines       17924    17924              
==========================================
- Hits         9288     9287       -1     
- Misses       8160     8161       +1     
  Partials      476      476

[thaJeztah]

changes LGTM, but can you update the commit description (you accidentally typed --publish instead of --platform 😄 )

[albers]

can you update the commit description (you accidentally typed --publish instead of --platform 😄 )

Thanks for catching 😅!
Fixed and rebased (there was a conflict with --stream from #678).

[albers]

@thaJeztah By the way, I got CI errors on #713 and #717 that survived several forced pushes, probably caused by

Could not update commit status. Message: Server returned HTTP response code: 201, message: 'Created' for URL: https://api.github.com/repos/docker/cli/statuses/9f5fb24854a578bcd9b778ff688efb9381efb68e

Do you know how I could get rid of these?

[vdemeester]

LGTM 🐮

[albers]

@thaJeztah The CI errors I asked you to look into are now gone after I rebased.

[thaJeztah]

oh! thanks for the ping

LGTM