add variable project_id

scaleway-k8s/templates/main.tf.j2

@@ -12,7 +12,7 @@ terraform {
    name    = "{{ project_name }}"
    version = "1.24.3"
    cni     = "cilium"
-   project_id = "81af2696-6120-4f45-baf3-d17fb0525824"
+   project_id = "{{ project_id }}"
    region = "{{ region_k8s }}"
  }