* feat: Add support for custom llama.cpp base image and forked llama-swap repositories
- Introduce BASE_LLAMACPP_IMAGE env var to customize llama.cpp base image
- Introduce LS_REPO env var to customize llama-swap source
- Use GITHUB_REPOSITORY env var to automatically detect forked repos
- Update container tagging to use dynamic repo paths
- Pass build args for BASE_IMAGE and LS_REPO to Containerfile
- Enable flexible release downloads from forked repositories
* chore: quote entire curl options, appease coderabbitai