Fix YAML indentation (on:/jobs: were nested under name:), correct
image name from shcizo/myapp to shcizo/pdga-rating, switch registry
auth from GITEA_TOKEN to PACKAGES_TOKEN (auto-injected token lacks
effective registry access), and add packages:write permission.
Remove docker-build.yml since deploy.yml now covers build + push +
deploy in one workflow — previously both triggered on tag push and
raced for the same image tags.