chore: fix resource tags for multi-runner example (#3601)

- fix resource taging in mult runner example
- align ephemeral example with default and mult-runner

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: npalm

Diff for: examples/ephemeral/.terraform.lock.hcl

@@ -61,6 +61,7 @@ terraform output webhook_secret
 
 | Name | Description | Type | Default | Required |
 |------|-------------|------|---------|:--------:|
+| <a name="input_environment"></a> [environment](#input\_environment) | Environment name, used as prefix | `string` | `null` | no |
 | <a name="input_github_app"></a> [github\_app](#input\_github\_app) | GitHub for API usages. | <pre>object({<br>    id         = string<br>    key_base64 = string<br>  })</pre> | n/a | yes |
 
 ## Outputs

Diff for: examples/ephemeral/README.md

@@ -1,5 +1,5 @@
 locals {
-  environment = "ephemeral"
+  environment = var.environment != null ? var.environment : "ephemeral"
   aws_region  = "eu-west-1"
 }
 

Diff for: examples/ephemeral/main.tf

@@ -6,3 +6,10 @@ variable "github_app" {
     key_base64 = string
   })
 }
+
+variable "environment" {
+  description = "Environment name, used as prefix"
+
+  type    = string
+  default = null
+}

Diff for: examples/ephemeral/variables.tf

@@ -57,7 +57,6 @@ module "runners" {
     id             = var.github_app.id
     webhook_secret = random_id.random.hex
   }
-
   # Assuming local build lambda's to use pre build ones, uncomment the lines below and download the
   # lambda zip files lambda_download
   # webhook_lambda_zip                = "../lambdas-download/webhook.zip"

Diff for: examples/multi-runner/main.tf

@@ -1,3 +1,9 @@
 provider "aws" {
   region = local.aws_region
+
+  default_tags {
+    tags = {
+      Example = local.environment
+    }
+  }
 }