v0.1.0

Initial release.

Added

• Event-driven reconcile over the Docker API (debounced, with periodic resync).
• Rules from container labels: promtag.rules (singleton group) and
  promtag.rules.<name> (named groups); each is validated and rendered to its
  own file.
• Owns the rules directory — orphaned files are pruned to match running containers.
• Reloads Prometheus via the --web.enable-lifecycle endpoint after changes.
• promtag_* metrics on /metrics and a /healthz liveness probe.
• Configuration via PROMTAG_* environment variables.
• Multi-arch image (linux/amd64, linux/arm64) on ghcr.io/davidborzek/promtag.