Bad Yaml results in silent failure

[jmickle]

During testing I was trying to figure out what was going on as the build kept wanting to push to dockerhub instead of ECR. This lead to a permissions error. The yaml itself was in correct indentation form and passed yaml linting however indentation was off to trigger the list properties for variables for this action. As a result it failed silently and continued moving on with an attempt to push to dockerhub instead of ECR.