[carry] Add support for template_driver in composefiles

[thaJeztah]

Carry of #1100 - rebased, and moved the option to schema 3.8
closes #1100

This maps the --template-driver flag on secret and config creation.

[thaJeztah]

ping @silvin-lubecki @vdemeester PTAL

[codecov-io]

Codecov Report

Merging #1746 into master will decrease coverage by 0.01%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master    #1746      +/-   ##
==========================================
- Coverage    56.1%   56.09%   -0.02%     
==========================================
  Files         306      306              
  Lines       21049    21057       +8     
==========================================
+ Hits        11810    11812       +2     
- Misses       8382     8386       +4     
- Partials      857      859       +2

[codecov-io]

Codecov Report

Merging #1746 into master will decrease coverage by 0.01%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master    #1746      +/-   ##
==========================================
- Coverage    56.1%   56.09%   -0.02%     
==========================================
  Files         306      306              
  Lines       21049    21057       +8     
==========================================
+ Hits        11810    11812       +2     
- Misses       8382     8386       +4     
- Partials      857      859       +2

[silvin-lubecki]

LGTM

[vdemeester]

Thanks 😍 LGTM 🦁
… but needs a rebase @thaJeztah

[thaJeztah]

ah, saw that one coming 😅 - working on another PR, but I'll update after 👍

[thaJeztah]

rebased; regenerated cli/compose/schema/bindata.go

[masaeedu]

Is the documentation at https://docs.docker.com/compose/compose-file generated from the source code here or is that a separate repo altogether?

[thaJeztah]

@masaeedu documentation there is not generated automatically, but from a Markdown file in https://github.com/docker/docker.github.io/blob/master/compose/compose-file/index.md

[masaeedu]

@thaJeztah Would that repo be the right place to open an issue to add documentation concerning template_driver and what variables are available? If I Ctrl+F template on https://docs.docker.com/compose/compose-file/ I get nothing.

[thaJeztah]

@masaeedu yes, that would be the right place. I think the reason it wasn't documented yet, was that docker-compose (standalone) did not yet have support for the 3.8 schema until docker/compose#7217 (which is in docker compose v1.25.5 and up: https://github.com/docker/compose/releases/tag/1.25.5.

I see docker/docs#10273 added some of the changes, but didn't include all of them. Let me have a look at updating the docs

[thaJeztah]

opened docker/docs#10980 to add some basic information (probably could use some enhancement after that, but at least the fields are mentioned now)