Ship packages as zip instead of tar.gz

[ruflin]

This is a breaking change and first needs changes on the Kibana side. The new registry and the new version of Kibana should be either rolled out in sync or Kibana supports both for a bit.

Closes #474

[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #628 updated]

• Start Time: 2020-09-08T07:23:13.343+0000

• Duration: 8 min 25 sec

Test stats 🧪

Test	Results
Failed	0
Passed	161
Skipped	0
Total	161

[ruflin]

Opening this as ready for review even though CI will be red on the integration tests. The reason is that Kibana does not support zip at the moment.

[mtojek]

Do you think it's feasible to prepare an archiver abstraction and support two modes (zip, tar.gz)?

[ruflin]

@mtojek Definitively possible but what would be the advantage of having the abstraction if we only plan to support one?

[mtojek]

Last time we also planned to support single one :) In the description you've written that we can't push it until Kibana supports the zip format. With an appropriate abstraction we don't need to wait for this.

[ruflin]

I realised, only Kibana can handle both as it is a single entry in the registry output (download). Lets not add abstraction for it before we are sure we will need it in the future.

As soon as elastic/kibana#76197 is merged I'll trigger CI again to see if it goes green.

[mtojek]

The implementation looks good to me, let's wait for the CI to pass all tests.

[ruflin]

jenkins, test this

[ruflin]

With 7.10 docker images from Kibana updated, this now seems to pass CI too and should be ready to be merged. @jfsiii @mtojek Would be good to get from both of you the 👍

[mtojek]

single nit-pick only