Support for rollback config in compose 3.7

[alshabib]

Fixes moby/moby#32585

- What I did

Built off #360 to provide support for rollback config in compose 3.4. ie.

  deploy:
      replicas: 1
      rollback_config:
        parallelism: 1

- How I did it

Added the key to the schema, regenerated the schema and tied it to existing UpdateConfig type.

- How to verify it

docker stack deploy -c docker-compose.yml yay

with the following stack:

version: '3.7'

services:
  busy:
    image: busybox
    deploy:
      replicas: 1
      rollback_config:
        parallelism: 1
    ports:
      - 80:80

- Description for the changelog
This pull request adds support for rollback configurations to be specified in the YAML stack file. Given that it is build off the aforementioned pull request, it supports also rollback_config.order.

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

[codecov-io]

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[dnephin]

LGTM

[alshabib]

anything blocking this?

[vdemeester]

LGTM 🐮

[vdemeester]

@vieux @dnephin has 17.08 freeze started or shouldn't this be for compose 3.5 ?

[sirlatrom]

@alshabib Any chance you could update this PR so it might make it into spec version 3.5?

[alshabib]

Sure. Just pushed an update.

[dnephin]

This needs to be moved to version 3.5 schema now, otherwise LGTM

[Vadus]

is this in 3.5 already ?

and does the rollback_config also work on <service> -> deploy: -> update_config: -> failure_action: rollback ?

[vdemeester]

@thaJeztah rebased, fixed conflicts and update to be on composefile 3.7 👼

[thaJeztah]

saw one thing, LGTM otherwise

[thaJeztah]

LGTM

we need a procedure to "stage" upcoming compose file changes (ie the 3.7 schema should be considered -dev until it's released)