Arseny Pinigin - Feature/lab10

[Hidancloud]

Goal

Complete Lab 10 by publishing QuickNotes to GHCR via tagged release CI, deploying it to Hugging Face Spaces, and completing the Cloudflare Tunnel bonus comparison.

Changes

• Added .github/workflows/release.yml for tag-triggered GHCR image publishing.
• Published ghcr.io/hidancloud/devops-intro/quicknotes:v0.1.0 and :latest.
• Added Hugging Face Space artifacts in cloud/huggingface-space/.
• Added Cloudflare Tunnel notes and latency helper in cloud/.
• Added Lab 10 submission with command output, analysis, screenshots, and external verification evidence.
• Added Check-Host evidence for Cloudflare Tunnel reachability from external regions.
• Documented HF cold-start limitation: current free cpu-basic Spaces sleep after 48h inactivity, so 3 cold samples were not practical to collect.

Testing

• go test ./...
• actionlint .github/workflows/release.yml
• git diff --check
• Verified green release workflow: https://github.com/Hidancloud/DevOps-Intro/actions/runs/28892339659
• Verified public GHCR pull and /health smoke test.
• Verified Hugging Face Space /health and /notes.
• Verified Cloudflare Tunnel /health locally and from Check-Host regions: DE, SG, US.

Checklist

• Title is a clear sentence (≤ 70 chars)
• Commits are signed (git log --show-signature)
• submissions/lab10.md updated