MarinSkyRL

Build + push the gpu-rl Docker image (`ghcr.io/open-thoughts/openthoughts-agent:gpu-rl`) — the RL runtime for CoreWeave H100 (torch 2.11.0+cu128 + the from-source vLLM fork + flash-attn 2.8.3 + skyrl-train/torchtitan EP) — IN the CoreWeave `cw-us-east-02a` cluster, AS AN IRIS JOB USING KANIKO. Self-contained to THIS repo (MarinSkyRL): the RL env is `uv sync --frozen` against `skyrl-train/{pyproject.toml,uv.lock}` (the lock is the single source of truth — no constraint file). Covers WHY kaniko not buildkit (the cluster denies CAP_SYS_ADMIN/bind-mounts + runs gVisor), the crane-export-over-ubuntu recipe, the load-bearing resource/flag settings (512GB node, per-instruction layers not `--single-snapshot`, `--cache`, ghcr GitHub-PAT creds), the Dockerfile gotchas baked into the build (uv `--index-strategy unsafe-best-match`, `python -m pip wheel`, torchtitan+tyro via the `ep` extra), the build-asserts-as-validation, capturing the digest + bumping `DEFAULT_RL_DOCKER_IMAGE`, monitoring the build job, and WHEN a rebu

Lint, run the pre-PR checks, commit, push, and author or update the branch's pull request in the required plain-text format. Use when committing, pushing, or creating/updating a PR.

Debug a code bug with a structured debug log that records hypotheses, changes, and results.

File a GitHub issue for a bug or improvement found this session.

Write or revise tests with an emphasis on behavior, regression coverage, pytest style, and avoiding "slop tests." Use when adding tests, fixing failing tests, reviewing test quality, or deciding what test would catch a bug.

Marin house writing style. Use when drafting or revising Marin-authored prose.