## Summary
- Add how-to guide (`docs/how-to/build-container-image.md`) covering the full container build workflow: directory layout, Dagger local builds, mise release task, and common patterns with links to existing containers
- Port navidrome from upstream `deluan/navidrome:0.60.3` to a custom three-stage build (`containers/navidrome/Dockerfile`) using Node + Go + Alpine
- Update navidrome deployment to use `registry.ops.eblu.me/blumeops/navidrome:v1.0.0`
## Deployment and Testing
- [x] `dagger call build --src=. --container-name=navidrome` builds successfully
- [ ] After merge: `mise run container-tag-and-release navidrome v1.0.0`
- [ ] After image published: `argocd app sync navidrome` and verify pod starts
Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/192
Erich Blume
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