feat: add arch flag to prometheus install

[dirien]

Signed-off-by: Engin Diri engin.diri@mail.schwarz

Description

Motivation and Context

• I have raised an issue to propose this change, which has been given a label of design/approved by a maintainer (required)
  Releates to Feature: system packages for Linux servers, CI and workstations #654

How Has This Been Tested?

root@bf0e69bea5a6:/workspace# ./arkade system install prometheus --arch amd64
Installing Prometheus to /usr/local/bin
Installing version: v2.34.0 for: amd64
Downloading from: https://github.com/prometheus/prometheus/releases/download/v2.34.0/prometheus-2.34.0.linux-amd64.tar.gz
72.77 MiB / 72.77 MiB [--------------------------------------------------------------------------------------------------------------------------------------------------------------------------] 100.00%
Downloaded to: /tmp/prometheus-2.34.0.linux-amd64.tar.gz
Unpacking binaries to: /tmp/prometheus4128823328
Copying binaries to: /usr/local/bin
root@bf0e69bea5a6:/workspace# 

Are you a GitHub Sponsor (Yes/No?)

• Yes
• No

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Documentation

• I have updated the list of tools in README.md if (required) with ./arkade get -o markdown
• I have updated the list of apps in README.md if (required) with ./arkade install --help

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have signed-off my commits with git commit -s
• I have added tests to cover my changes.
• All new and existing tests passed.

• I have tested this on arm, or have added code to prevent deployment

[alexellis]

LGTM