Azure-pipelines-tasks: NodeTool does not work on ARM

[timfish]

Question, Bug, or Feature?
Type: Bug

Enter Task Name: NodeTool

Environment

• Server - Azure Pipelines
• Agent - Private - Raspberry Pi 3b+

Issue Description

##[section]Starting: Install Node.js
==============================================================================
Task         : Node.js Tool Installer
Description  : Finds or downloads and caches the specified version spec of Node.js and adds it to the PATH.
Version      : 0.149.0
Author       : Microsoft Corporation
Help         : 
==============================================================================
##[error]Unable to find Node version '8.x' for platform linux and architecture arm.
##[section]Finishing: Install Node.js

This is because os.arch() equals arm but valid downloads are one of linux-arm64, linux-armv6l, linux-armv7l.

[damccorm]

@stephenmichaelf could you take a look? I think we just need to special case this one.

[github-actions[bot]]

This issue is stale because it has been open for 180 days with no activity. Remove the stale label or comment on the issue otherwise this will be closed in 5 days

[timfish]

I've prepared a PR to fix this!