[FBZ-3910] Adds functionality to v6 for sidekiq 6 and later

[mushyy]

No description provided.

[herbertia]

We upgraded our application to stack v6, ruby 2.7 and Rails 6. Our version of Sidekiq 5.2 was having issue on reloading and we had to migrate to the version 6 of Sidekiq.
As the previous recipe of Sidekiq was not compatible with Sidekiq6 and we needed the recipe urgently, we duplicated your code and make it work.
Here are the modifications we did in order to have the recipe working waiting the official release.

[kstych]

with the suggested changes incorporated , and confirmation of working recipe , this looks good.

[dvalfre]

For the record, this PR addresses issue #214

[dvalfre]

Description of your patch

Adds recipes to be able to run Sidekiq 6.

Recommended Release Notes

Adds support for Sidekiq 6.

Estimated risk

Low. The recipes were built specifically for Sidekiq 6 to avoid breaking changes.

Components involved

A new core and custom recipe for Sidekiq 6.

Dependencies

None.

Description of testing done

Booted several environments where the recipe was uploaded and applied.

QA Instructions

• Choose any application, and record its name.
• Boot a v6 environment with a utility instance named sidekiq6
• Add environment variables EY_SIDEKIQ6_ENABLED=TRUE and EY_SIDEKIQ6_INSTANCES_NAME=sidekiq6.
• Run 'apply' on the environment.
• SSH into the sidekiq6 instance, run systemctl restart sidekiq_<application_name>_1, where <application_name> is the one recorded above.

[kvbautista]

Modified ey-base/metadata.rb to include sidekiq6 recipe.

Updated cookbooks/sidekiq6/spec/attributes_spec.rb and cookbooks/sidekiq6/spec/setup_spec.rb to includes environment variables for Sidekiq6 (EY_SIDEKIQ6_*)

with the changes above, this looks good to me.