Installer: add support for `arm6l` architecture

[ppawlowski]

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

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