Container Layer

Build a reproducible, cached environment overlay for ephemeral containers using a Dockerfile-like spec.

Concept

The container resets every session, but your environment shouldn't. This skill:

1. Parses a Containerfile (Dockerfile subset) that declares your environment
2. Caches the built result as a tarball in GitHub Releases
3. Restores from cache on subsequent boots (single fetch vs. N installs)
4. Provides a uv shim that captures ad-hoc installs back into the Containerfile

Supported Containerfile Instructions

# Environment variables
ENV KEY=value