Installer: add support for `arm6l` architecture

### Description

Currently, installer supports only `arm` and `arm7l` architecture. The goal of this task is to add support for `arm6l` one.
Before proceeding, ensure that:
* golang can crossbuild binaries for `arm6l`
* `arm6l` and `arm7l` architecture can be easily detected in the script

Tip: Nodejs for `arm6l` can be fetched from https://unofficial-builds.nodejs.org/download/release/

### Epic/Story

_No response_