Add a Dockerfile

[Krast76]

Hi 👋 ,

This PR add a Dockerfile.

After building it, with this alias on your shell :

$ alias tfk8s='docker run -i --rm jrhouston/tfk8s:0.1.1'

You can use tfk8s without Go on your laptop :

$ kubectl run nginx --image=nginx --dry-run=client -o yaml | tfk8s
resource "kubernetes_manifest" "pod_nginx" {
  manifest = {
    "apiVersion" = "v1"
    "kind" = "Pod"
    "metadata" = {
      "creationTimestamp" = null
      "labels" = {
        "run" = "nginx"
      }
      "name" = "nginx"
    }
    "spec" = {
      "containers" = [
        {
          "image" = "nginx"
          "name" = "nginx"
          "resources" = {}
        },
      ]
      "dnsPolicy" = "ClusterFirst"
      "restartPolicy" = "Always"
    }
    "status" = {}
  }
}

[jrhouston]

Thanks for adding this @Krast76. I shuffled some things around so I could re-use the make build target inside the docker build container, that way the toolVersion argument doesn't have to be duplicated. I also added a docker-push target so I can push it to docker hub.