v1.0.0

Added

• Initial release: the ephemeractl GitHub Action. On a pull request it
  queries OpenCost for the actual running cost so far of that PR's Kubernetes
  preview environment and upserts a sticky cost comment, with an optional
  per-team breakdown.
• Label or namespace selector for mapping a PR to its workloads.
• GitHub Enterprise Server support via GITHUB_API_URL.
• Distroless Docker action image published to ghcr.io/alexremn/ephemeractl.

Security

• All CI/release GitHub Actions pinned to full commit SHAs; Dependabot enabled
  to keep them current.
• Distroless nonroot runtime image; multi-arch (amd64/arm64) with SLSA build
  provenance and SBOM attestations published on each release.

Full Changelog: https://github.com/alexremn/ephemeractl/commits/v1.0.0