Support Nerdctl/Podman

[ananthb]

Environment

MacOS running on Apple Silicon

• Elixir version (elixir -v): 1.17.3
• Nerves environment: (mix nerves.env --info)
• Additional information about your host, target hardware or environment that
  may help

Current behavior

Include errors, stacktraces, screenshots or code that may help us reproduce the
issue.

When I run mix nerves.system.shell I get this error message.

** (Mix) Docker is not installed on your machine.
Please install docker ~> 1.12 or ~> 1.12.0-rc2 or >= 17.0.0 or later

I don't have Docker installed so that makes sense.

Expected behavior

I do have nerdctl installed which is a drop-in, fully compatible replacement for Docker. I'd like to contribute support for that and additionally for building nerves systems with Podman as well.

[ananthb]

I need a bit of help locating the code which actually uses Docker to run builds.