example: added docker local workspace (#1025)

examples/docker-local/README.md

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+---
+name: Develop in Docker on the same host that runs Coder
+description: Get started with Linux development using a Docker container locally as workspace provider.
+tags: [local, docker]
+---

examples/docker-local/main.tf

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+terraform {
+  required_providers {
+    coder = {
+      source  = "coder/coder"
+      version = "~> 0.3.1"
+    }
+    docker = {
+      source  = "kreuzwerker/docker"
+      version = "~> 2.16.0"
+    }
+  }
+}
+
+provider "docker" {
+  host = "unix:///var/run/docker.sock"
+}
+
+data "coder_workspace" "me" {
+}
+
+resource "coder_agent" "dev" {
+  arch = "amd64"
+  os   = "linux"
+}
+
+variable "docker_image" {
+  description = "What docker image would you like to use for your workspace?"
+  default     = "codercom/enterprise-base:ubuntu"
+  validation {
+    condition     = contains(["codercom/enterprise-base:ubuntu", "codercom/enterprise-node:ubuntu", "codercom/enterprise-java:ubuntu"], var.docker_image)
+    error_message = "Invalid Docker Image!"
+  }
+}
+
+resource "docker_volume" "coder_volume" {
+  name = "coder-${data.coder_workspace.me.owner}-${data.coder_workspace.me.name}-root"
+}
+
+resource "docker_container" "workspace" {
+  count = data.coder_workspace.me.start_count
+  image   = var.docker_image
+  name    = "coder-${data.coder_workspace.me.owner}-${data.coder_workspace.me.name}-root"
+  dns     = ["1.1.1.1"]
+  command = ["sh", "-c", coder_agent.dev.init_script]
+  env     = ["CODER_TOKEN=${coder_agent.dev.token}"]
+  volumes {
+    container_path = "/home/coder/"
+    volume_name    = docker_volume.coder_volume.name
+    read_only      = false
+  }
+}