update demo project

Author: ohdoking

.github/workflows/deploy-to-ecr.yaml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
 
+env:
+  AWS_REGION: "eu-central-1"                   # set this to your preferred AWS region, e.g. us-west-1
+  
 jobs:
   deploy:
     runs-on: ubuntu-latest