Write Linux installation instructions

[dwelsch-esi]

Overview

Write the installation instructions marked "TBD" at:
https://etcd.io/docs/v3.5/install/#linux

Audience: Operator doing non-Kubernetes production install (or anyone who must install etcd in a production cluster on Linux)

Type: Task

The existing documentation might contain helpful source material that you can pull into this doc change. See recommendations for the existing (at the time of the CNCF tech doc analysis) etcd technical documentation pages:
https://github.com/cncf/techdocs/blob/main/assessments/0010-etcd/etcd-implementation.md/#general-reorganization

🎤 Context

This issue tracks recommended changes resulting from an analysis of the etcd documentation commissioned by CNCF. The analysis and supporting documents are here: https://github.com/cncf/techdocs/tree/main/assessments/0010-etcd/

✌️ Possible Implementation

Write a step-by-step installation procedure.

Use the following form (a typical task template) for the procedure:

• Prerequisites (bullet list of prerequisite conditions, if any)
• Procedure
  • Step 1 (keep steps discrete and atomic. Put command-line input and expected output in a code block.)
  • Step 2 ...
• Result (Include how to test that the installation is successful. Describe output or side effects if they're notable or unexpected.)

[ivanvc]

/assign