Update runs-on.yml with region and use AMI ID directly in ci.yml

Author: mmcky

.github/runs-on.yml

@@ -2,4 +2,5 @@ images:
   quantecon_ubuntu2404:
     platform: "linux"
     arch: "x64"
-    ami: "ami-0edec81935264b6d3"
+    ami: "ami-0edec81935264b6d3"
+    region: "us-west-2"

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ on:
         type: string
 jobs:
   preview:
-    runs-on: "runs-on=${{ github.run_id }}/family=g4dn.2xlarge/image=quantecon_ubuntu2404/disk=large"
+    runs-on: "runs-on=${{ github.run_id }}/family=g4dn.2xlarge/image=ami-0edec81935264b6d3/disk=large"
     env:
       NETLIFY_AUTH_TOKEN: ${{ secrets.NETLIFY_AUTH_TOKEN }}
       NETLIFY_SITE_ID: ${{ secrets.NETLIFY_SITE_ID }}