feat: add git clone module (#46)

* feat: add `git-clone` module

* Fix script expansion for personalize

* Update README

git-clone/main.tf

@@ -0,0 +1,37 @@
+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    coder = {
+      source  = "coder/coder"
+      version = ">= 0.11"
+    }
+  }
+}
+
+variable "url" {
+    description = "The URL of the Git repository."
+    type        = string
+}
+
+variable "path" {
+  default     = ""
+  description = "The path to clone the repository. Defaults to \"$HOME/<basename of url>\"."
+  type        = string
+}
+
+variable "agent_id" {
+    description = "The ID of a Coder agent."
+    type        = string
+}
+
+resource "coder_script" "git_clone" {
+    agent_id = var.agent_id
+    display_name = "Git Clone"
+    icon = "/icons/git.svg"
+    script = templatefile("${path.module}/run.sh", {
+      CLONE_PATH: var.path != "" ? var.path : join("/", ["~", basename(var.url)]),
+      REPO_URL: var.url,
+    })
+    run_on_start = true
+}