feat: Add key_name variable for EC2 SSH access and update example configuration

Author: 02loveslollipop

infra/terraform/media_relay/README.md

@@ -21,6 +21,7 @@ Key variables:
 | `publish_user` / `publish_pass` | Credentials the SBC uses to publish | **required** |
 | `viewer_user` / `viewer_pass` | Playback credentials (`viewer_user=any` allows anonymous access) | `any` / empty |
 | `allowed_cidrs` | List of CIDR blocks allowed to reach the relay | `["0.0.0.0/0"]` |
+| `key_name` | EC2 key pair used for SSH access | `orion` |
 | `existing_eip_allocation_id` | Allocation ID of an existing Elastic IP to reuse | `null` |
 | `mediamtx_version` | Container tag pulled from Docker Hub | `1.15.3` |
 | `tags` | Extra tags applied to every resource | `{}` |

infra/terraform/media_relay/terraform.tfvars.example

@@ -6,4 +6,5 @@ viewer_user   = "any"
 viewer_pass   = ""
 allowed_cidrs = ["0.0.0.0/0"]
 instance_type = "t3.small"
+#key_name      = "orion"
 #existing_eip_allocation_id = "eipalloc-0123456789abcdef0"

infra/terraform/media_relay/variables.tf

@@ -49,7 +49,7 @@ variable "instance_type" {
 variable "key_name" {
   description = "Optional EC2 key pair name for SSH access"
   type        = string
-  default     = null
+  default     = "orion"
 }
 
 variable "vpc_id" {