chore(ci): install d8 via curl

[universal-itengineer]

Description

Install deckhouse-cli via curl

Why do we need it, and what problem does it solve?

A temporary solution to avoid accessibility issues with deckhouse.ru

What is the expected result?

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

section: ci
type: chore
summary: install deckhouse-cli via curl