name: Fix bun temp
description: >
  Redirect bun's cache/temp to a runner-writable dir. Bun creates root-owned
  temp dirs during the Docker image build; GH Actions runs container jobs as
  the `runner` user with HOME=/github/home, so without this redirect bun hits
  EACCES on its default temp paths. Shared by every eval lane — extracted from
  three byte-identical copies (legacy matrix, sliced lane, periodic).
runs:
  using: composite
  steps:
    - shell: bash
      run: |
        mkdir -p /home/runner/.cache/bun
        {
          echo "BUN_INSTALL_CACHE_DIR=/home/runner/.cache/bun"
          echo "BUN_TMPDIR=/home/runner/.cache/bun"
          echo "TMPDIR=/home/runner/.cache"
        } >> "$GITHUB_ENV"