feat: Container release via GitHub Actions + ghcr.io

[pmcfadin]

Summary

Add Docker containerization and automated container image publishing via GitHub Actions to ghcr.io.

Acceptance Criteria

Files to Create

1. .dockerignore - Exclude build artifacts, node_modules, .git, docs, editor configs
2. docker/nginx.conf.template - Nginx config with:
   • Port 8080 (non-privileged)
   • SPA routing (try_files)
   • API reverse proxy to ${API_BACKEND_URL} (default http://localhost:8443)
   • Cache headers (immutable for hashed assets, no-cache for index.html)
   • Gzip compression
3. Dockerfile - Multi-stage build:
   • Stage 1: node:22-alpine, npm ci, npm run build
   • Stage 2: nginx:alpine, serve static files (~45-55 MB final image)
4. .github/workflows/container-release.yml - GitHub Actions workflow:
   • Triggers: push to main, v* tags
   • Build & push to ghcr.io/killrvideo/killrvideo-react-frontend
   • Tags: latest + sha on main, semver on v* tags

Verification

• docker build -t killrvideo-frontend:local . builds successfully
• SPA routing works (non-root paths return 200 with index.html)
• /assets/* has Cache-Control: public, immutable
• index.html has Cache-Control: no-cache
• Final image is ~45-55 MB
• GitHub Actions workflow triggers on push to main

[pmcfadin]

⏳ Starting implementation of container release infrastructure.

[pmcfadin]

✅ Done. PR #49 opened with all 4 files.