Support Podman either as alias to Docker or natively

It would be great if Podman could be used in addition to Docker for building images.

I had to install Docker to be able to use Copilot. But I don't think this has to be necessary as most of the Docker commands can be replaced by running `podman` in place of `docker` (as far as I know).

I realise, that it might be easier to accept a docker alias from the shell environment than it is to implement a new client like in [dockerengine.go](https://github.com/aws/copilot-cli/blob/mainline/internal/pkg/docker/dockerengine/dockerengine.go).
Under `e2e` there already seems to be an implementation that makes use of the bash shell context by running `bash -c docker ...`: https://github.com/aws/copilot-cli/blob/f1b8e46522fd46755152bba4ce1ecb70c11e11bc/e2e/internal/client/docker.go#L54-L56

Would this be a possible future addition or is there any technical limitation preventing Podman from being used here?

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Support Podman either as alias to Docker or natively #3170

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	func (d *Docker) exec(command string, opts ...cmd.Option) error {
	return BashExec(fmt.Sprintf("docker %s", command), opts...)
	}