Add .gitea/workflows/build-and-push.yml that builds and pushes the Docker
image to git.hty1024.com/hty1024/ai-app-ops-tools on three triggers: push
to main, push of a v*.*.* tag, and manual workflow_dispatch with an
optional custom tag. Uses docker/metadata-action to derive sensible tags
(branch name, semver, short sha, latest on default branch) and registry-
backed Buildx cache to speed up repeated builds.
README gains a CI/CD section covering trigger rules, one-time setup
(runner registration + GITEA_TOKEN secret with write:package scope), and
how to pull / consume the published image.
Co-Authored-By: Claude Opus 4 <noreply@anthropic.com>
