DockerInstall task fails on ARM (works for AMD64 and ARM64)

[winromulus]

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Question, Bug, or Feature?
Type: Bug

Enter Task Name: DockerInstall

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Environment

• Server - Azure Pipelines

  • If using Azure Pipelines, provide the account name, team project name, build definition name/build number:
    https://dev.azure.com/emberstack/OpenSource/_build/results?buildId=551&view=logs&j=8dade74f-fede-5060-160b-6b0a43c8e18e&t=338a6baf-a2fc-5c95-0a69-215093f6d564&s=ab6e269b-88b2-5ded-2544-4aa5b1124530

• Agent - Private:
  Version: 2.171.1

Issue Description

DockerInstall task downloads docker-cli for the wrong architecture on ARM based agents. It pulls x86_x64 instead of arm.
It works correctly on arm64 and amd64.

Task logs

2020-06-29T14:20:13.7075220Z ##[section]Starting: Docker install
2020-06-29T14:20:13.7106031Z ==============================================================================
2020-06-29T14:20:13.7110056Z Task         : Docker CLI installer
2020-06-29T14:20:13.7112174Z Description  : Install Docker CLI on agent machine.
2020-06-29T14:20:13.7114059Z Version      : 0.171.0
2020-06-29T14:20:13.7115895Z Author       : Microsoft Corporation
2020-06-29T14:20:13.7117918Z Help         : https://aka.ms/azpipes-docker-installer-tsg
2020-06-29T14:20:13.7124026Z ==============================================================================
2020-06-29T14:20:14.6425124Z Downloading: https://download.docker.com/linux/static/stable/x86_64/docker-19.03.5.tgz
2020-06-29T14:20:18.9932279Z Extracting archive
2020-06-29T14:20:19.0110634Z [command]/bin/tar xzC /azp/agent/_work/_temp/e5a2aa74-9dc8-4f24-9f1e-93e351d4e2fb -f /azp/agent/_work/_temp/docker-d1f634cd-7d25-4e33-bd04-abebdcf72b01.tgz
2020-06-29T14:20:24.6989526Z Caching tool: docker-stable 19.3.5 arm
2020-06-29T14:20:26.1322573Z Prepending PATH environment variable with directory: /azp/agent/_work/_tool/docker-stable/19.3.5/arm
2020-06-29T14:20:26.1343364Z Verifying docker installation...
2020-06-29T14:20:26.1365200Z [command]/azp/agent/_work/_tool/docker-stable/19.3.5/arm/docker --version
2020-06-29T14:20:26.6369416Z /azp/agent/_work/_tool/docker-stable/19.3.5/arm/docker: 1: /azp/agent/_work/_tool/docker-stable/19.3.5/arm/docker: Syntax error: Unterminated quoted string
2020-06-29T14:20:26.6549447Z ##[error]Error: The process '/azp/agent/_work/_tool/docker-stable/19.3.5/arm/docker' failed with exit code 2
2020-06-29T14:20:26.6744861Z ##[section]Finishing: Docker install