Add code to create shell runner

Author: rajat-tomar

main.tf

@@ -0,0 +1,43 @@
+locals {
+  tags = {
+    Name      = "gitlab-shell-runner"
+    ManagedBy = "Terraform"
+  }
+  runner_user_data = templatefile("${path.module}/templates/runner.tftpl", {
+    gitlab_url                = var.gitlab_url
+    runner_registration_token = var.runner_registration_token
+    runner_description        = var.runner_description
+    runner_tags               = "\"${join(", ", var.runner_tags)}\""
+    run_untagged_jobs         = var.run_untagged_jobs
+    runner_locked             = var.runner_locked
+  })
+}
+
+resource "aws_key_pair" "this" {
+  count = var.ssh_public_key != null ? 1 : 0
+
+  key_name   = "gitlab-shell-runner"
+  public_key = var.ssh_public_key
+
+  tags = merge(
+    local.tags,
+    var.additional_tags,
+  )
+}
+
+resource "aws_instance" "this" {
+  count = var.instance_count
+
+  ami                         = var.ami_id
+  instance_type               = var.instance_type
+  key_name                    = var.ssh_public_key != null ? aws_key_pair.this[0].key_name : null
+  vpc_security_group_ids      = var.vpc_security_group_ids
+  subnet_id                   = var.subnet_id
+  user_data                   = local.runner_user_data
+  user_data_replace_on_change = true
+
+  tags = merge(
+    local.tags,
+    var.additional_tags,
+  )
+}

outputs.tf

@@ -0,0 +1,12 @@
+#! /bin/bash
+
+sudo gitlab-runner register \
+  --non-interactive \
+  --url ${gitlab_url} \
+  --registration-token ${runner_registration_token} \
+  --executor shell \
+  --description ${runner_description} \
+  --tag-list ${runner_tags} \
+  --run-untagged=${run_untagged_jobs} \
+  --locked=${runner_locked} \
+  --access-level="not_protected"

templates/runner.tftpl

@@ -0,0 +1,73 @@
+variable "ami_id" {
+  description = "AMI to use for the instance"
+  type        = string
+}
+
+variable "instance_type" {
+  description = "Type of instance to provision"
+  type        = string
+}
+
+variable "instance_count" {
+  description = "Number of instances to provision"
+  type        = number
+  default     = 1
+}
+
+variable "vpc_security_group_ids" {
+  description = "List of security group IDs to associate"
+  type        = list(string)
+  default     = []
+}
+
+variable "subnet_id" {
+  description = "VPC Subnet ID to launch in"
+  type        = string
+  default     = ""
+}
+
+variable "additional_tags" {
+  description = "Additional tags to apply to the resources"
+  type        = map(string)
+  default     = {}
+}
+
+variable "gitlab_url" {
+  description = "Gitlab URL"
+  type        = string
+}
+
+variable "runner_registration_token" {
+  description = "Gitlab registration token"
+  type        = string
+}
+
+variable "runner_description" {
+  description = "Description for Gitlab Runners"
+  type        = string
+  default     = "Shell Runner"
+}
+
+variable "runner_tags" {
+  description = "Runner tags"
+  type        = list(string)
+  default     = ["shell", "aws"]
+}
+
+variable "run_untagged_jobs" {
+  description = "Run untagged jobs or not"
+  type        = bool
+  default     = true
+}
+
+variable "runner_locked" {
+  description = "Lock the runner or not"
+  type        = bool
+  default     = false
+}
+
+variable "ssh_public_key" {
+  description = "SSH public key to use for the key pair"
+  type        = string
+  default     = null
+}

variables.tf

@@ -0,0 +1,10 @@
+terraform {
+  required_providers {
+    aws = {
+      source  = "hashicorp/aws"
+      version = ">= 4.49.0"
+    }
+  }
+
+  required_version = "~> 1.3.0"
+}