Update DEPLOY.md: Google Container Registry API required
Google Container Registry API needs to be enabled in the project, else the following error ocurrs:
denied: Token exchange failed for project 'recommended-ludoj'. Please enable Google Container Registry API in Cloud Console at https://console.cloud.google.com/apis/api/containerregistry.googleapis.com/overview?project=recommended-ludoj before performing this operation.
Add this to DEPLOY.md
.