I’m trying to deploy a container into Lightsail, but it is failing, and I can’t figure out which mistake I made.

I am following this blog post

I could do everything up to step 5, including pushing the Docker image into AWS ECR.

The step that I’m struggling with is step 5 of the deployment process. The part where I am failing is

- name: Push the Docker Image to lightsail
    env: 
      IMAGE_SHA_TAG: ${{ github.sha }}
      IMAGE_URL: ${{vars.LIGHTSAIL_IMAGE}}:${{ github.sha }}
    run: >
      aws lightsail push-container-image
      --service-name ${{ vars.SERVICE_NAME }}
      --image $IMAGE_URL
      --region us-east-2
      --label git-push      
- name: Save updated LIGHTSAIL_IMAGE_TAG 
    run: |
      echo "LIGHTSAIL_DOCKER_IMAGE=$(aws lightsail get-container-images --service-name ${{ vars.SERVICE_NAME }} --region us-east-2 | jq -r .containerImages[0].image)"  >> $GITHUB_ENV

I executed aws lightsail get-container-images --service-name ${{ vars.SERVICE_NAME }} --region us-east-2 and I get

{
    "containerImages": []
}

I am not sure what should I put in var LIGHTSAIL_IMAGE. Now I am referencing the ECR repository URI, but it is not working.