- Use REGISTRY_HOSTPORT for registry (not docker.io or ghcr.io)
- Use REGISTRY_USERNAME/REGISTRY_PASSWORD for auth
- Fix repo path to not include full URL or username prefix
- Replace complex caching with simple Dockerfile
- Remove cargo-chef complexity that was slowing builds
- Add .woodpecker-base.yml for separate base image builds
- Add Dockerfile.simple for faster builds
- Add Dockerfile.ultrafast for when base image exists