feat: add dotfiles module (#33)

Co-authored-by: Muhammad Atif Ali <atif@coder.com>

dotfiles/README.md

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+---
+display_name: Dotfiles
+description: Allow developers to optionally bring their own dotfiles repository to customize their shell and IDE settings!
+icon: ../.icons/dotfiles.svg
+maintainer_github: coder
+verified: true
+tags: [helper]
+---
+
+# Dotfiles
+
+Allow developers to optionally bring their own [dotfiles repository](https://dotfiles.github.io)! Under the hood, this module uses the [coder dotfiles](https://coder.com/docs/v2/latest/dotfiles) command.

dotfiles/main.tf

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+terraform {
+  required_version = ">= 1.0"
+
+  required_providers {
+    coder = {
+      source  = "coder/coder"
+      version = ">= 0.12"
+    }
+  }
+}
+
+variable "agent_id" {
+  type        = string
+  description = "The ID of a Coder agent."
+}
+
+data "coder_parameter" "dotfiles_uri" {
+  type         = "string"
+  display_name = "Dotfiles URL (optional)"
+  default      = ""
+  description  = "Enter a URL for a [dotfiles repository](https://dotfiles.github.io) to personalize your workspace"
+  mutable      = true
+  icon         = "https://raw.githubusercontent.com/jglovier/dotfiles-logo/main/dotfiles-logo-icon.svg"
+}
+
+resource "coder_script" "personalize" {
+  agent_id     = var.agent_id
+  script       = <<-EOT
+    DOTFILES_URI="${data.coder_parameter.dotfiles_uri.value}"
+    if [ -n "$${DOTFILES_URI// }" ]; then
+    coder dotfiles "$DOTFILES_URI" -y 2>&1 | tee -a ~/.dotfiles.log
+    fi
+    EOT
+  display_name = "Dotfiles"
+  icon         = "https://raw.githubusercontent.com/jglovier/dotfiles-logo/main/dotfiles-logo-icon.svg"
+  run_on_start = true
+}