Add crane CLI to the runtime Dockerfile so the index builder can pull the
latest SPA shell from the Forgejo container registry on each cycle. The
existing syncSiteBuild logic checks for a newer image digest, extracts
the dist/ assets via crane export, and overlays generated JSON data files
on top before deploying to Cloudflare Pages.
- Dockerfile: install go-containerregistry crane binary (v0.20.2)
- sitebuild.go: new file with syncSiteBuild, craneDigest, craneExport,
digest caching, fallback to baked-in /app/web/dist
- main.go: wire initCraneAuth at startup, replace hardcoded webDistDir
with syncSiteBuild call in runBuildCycle
- sitebuild_test.go: 18 tests for extractRegistry, digest caching,
fallback logic, crane auth config, and copyWebAssets overlay behavior
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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