Automatic CICD pipeline from docker image on Google cloud

I need an automatic CI/CD pipeline on Google Cloud

Pipeline should be:
1) Docker Image with certain tag added to GCP Artifact Registry (tag triggers pipeline)
2) Docker Image either creates or updates a trigger in Cloud Build
3) Cloud Build either creates or updates deployment on Cloud Run

There should be no manual entry needed, hence the yaml/dockerfile must be automatically composed based on the docker image in step 1.