Refactor main.tf and add infra mix tasks

Refactor main.tf to use the correct project name (oops).

Add terraform infra(structure) tasks to projects mix file:
  - infra.apply: Deploys the infra. according using terraform
  - infra.destroy: Destroys the currently deployed infrastructure
  - infra.plan: Plans a deployment using terraform

infra/main.tf

@@ -0,0 +1,83 @@
+# vim:foldmethod=indent
+
+provider "google" {
+  version = "3.8.0"
+  project = var.project_id
+  region  = "us-east4"
+  zone    = "us-east4-b"
+}
+
+variable "ssh_keys" {
+  type        = string
+  description = "The ssh username and key in the format `username:ssh-key`."
+}
+
+variable "project_id" {
+  type        = string
+  description = "The name of the google cloud project you're deploying to."
+}
+
+variable "deletion_protection" {
+  type        = bool
+  description = "Whether to apply deletion protection to the shortnr-instance."
+  default     = true
+}
+
+output "shortnr_static_ip" {
+  value       = google_compute_address.shortnr.address
+  description = "The public static IP address used by the Shortnr instance."
+}
+
+data "google_compute_image" "debian_image" {
+  family  = "debian-10"
+  project = "debian-cloud"
+}
+
+resource "google_compute_address" "shortnr" {
+  name = "shortnr-address"
+}
+
+resource "google_compute_instance" "shortnr" {
+  name                = "shortnr-instance"
+  machine_type        = "f1-micro"
+  deletion_protection = var.deletion_protection
+
+  boot_disk {
+    auto_delete = true
+
+    initialize_params {
+      image = data.google_compute_image.debian_image.self_link
+    }
+  }
+
+  network_interface {
+    network = "default"
+    access_config {
+      nat_ip = google_compute_address.shortnr.address
+    }
+  }
+
+  metadata = {
+    ssh-keys = var.ssh_keys
+  }
+}
+
+resource "google_compute_firewall" "http_server" {
+  name    = "http-server"
+  network = "default"
+
+  allow {
+    protocol = "tcp"
+    ports    = ["80"]
+  }
+}
+
+resource "google_compute_firewall" "docker_machine" {
+  name    = "docker-machine"
+  network = "default"
+
+  allow {
+    protocol = "tcp"
+    ports    = ["2376"]
+  }
+}