Action uselessly requires a running daemon with Kubernetes driver

[antoinedeschenes]

Behaviour

Steps to reproduce this issue

1. Setup a self-hoster runner without any docker daemon.
2. Use docker/setup-buildx-action with driver: kubernetes

Expected behaviour

docker buildx create should create a new builder instance.

Actual behaviour

Action fails during the Docker info step, as it calls docker version and docker info, both of which expect a running docker daemon.

setup-buildx-action/src/main.ts

Lines 13 to 16 in 20111c6

	core.startGroup(`Docker info`);
	await exec.exec('docker', ['version']);
	await exec.exec('docker', ['info']);
	core.endGroup();

Configuration

jobs:
  build-push:
    runs-on: self-hosted
    steps:
      - name: setup buildx
        uses: docker/setup-buildx-action@v1
        with:
          driver: kubernetes
          driver-opts: |
            namespace=my-namespace
            requests.cpu=1
            limits.cpu=1
            requests.memory=1Gi
            limits.memory=1Gi
            nodeselector=kubernetes.io/arch=amd64
            rootless=true

Logs

Example of Docker info step:

$ docker version
Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?
Client:
 Cloud integration: v1.0.22
 Version:           20.10.13
 API version:       1.41
 Go version:        go1.16.15
 Git commit:        a224086
 Built:             Thu Mar 10 14:08:43 2022
 OS/Arch:           linux/amd64
 Context:           default
 Experimental:      true

[crazy-max]

Yes this would be covered by #119. cc @tonistiigi