command/exec: Fill ConsoleSize

[vvoland]

Depends on:

• container/exec: Support ConsoleSize moby/moby#43622 (adds execConfig.ConsoleSize in vendor/github.com/docker/docker)
• vendor: github.com/docker/docker 4eb1c5bd52afa08595d9a082a9ba05c81f79be07 #3688

Relates to:

• investigate terminal resize issues, and (if possible) set size on creation #3554

This makes the exec'd process started with console dimensions matching the users terminal.

- How I did it
Set the exec config ConsoleSize to cli stdout tty size

- How to verify it

# resize terminal from the default size

cid=$(docker run -d ubuntu sleep infinity)

docker exec -it $cid stty size
# check if the printed size is as expected

docker exec -it $cid top -n 1
# check if top UI is rendered at the full terminal size

- Description for the changelog

docker exec -t now sets the console size for the exec'd process immediately when it's created

- A picture of a cute animal (not mandatory but encouraged)

[codecov-commenter]

Codecov Report

Merging #3627 (a141f1c) into master (bb5c357) will decrease coverage by 0.01%.
The diff coverage is 46.15%.

@@            Coverage Diff             @@
##           master    #3627      +/-   ##
==========================================
- Coverage   59.01%   59.00%   -0.02%     
==========================================
  Files         289      289              
  Lines       24623    24634      +11     
==========================================
+ Hits        14532    14536       +4     
- Misses       9218     9224       +6     
- Partials      873      874       +1     

[thaJeztah]

LGTM