Containers: Support ARM 32bit

[JamesGreenaway]

VSCode: 1.40.0
Remote SSH: 1.47.2
Mac: 10.15.1
Remote OS: Raspbian Buster

I am attempting to run Remote - SSH inside a container running on a remote docker host.
Steps to reproduce:

1. add a basic .devcontainer.json:

{
  "image": "node",
  "workspaceFolder": "/workspace",
  "workspaceMount": "src=remote-workspace,dst=/workspace,type=volume,volume-driver=local"
}

2. add the following to settings.json:

"docker.host":"tcp://your-remote-machine-fqdn-or-ip-here:port"

3. Run 'Open folder in container'

Error message:

...
...Exec format error
Command failed: docker exec -w /home/vscode/.vscode-server/bin/86405ea23e3937316009fc27c9361deee66ffbf5 -e SHELL=/bin/bash -e VSCODE_AGENT_FOLDER=/home/vscode/.vscode-server 9f04be659d8bc717879dc006e2f1b0e2209208bd513e6eb342f9f094910b063b /home/vscode/.vscode-server/bin/86405ea23e3937316009fc27c9361deee66ffbf5/server.sh --disable-user-env-probe --port 0

[chrmarti]

Related: #1716

[chrmarti]

Fixed with #1716.