OFAT Matrix LLM Tuning#

When a new provider or model lands and you have to decide what temperature, max_tokens, tool_choice, prompt-shape, and turn budget to ship in production, the default is to pick by hunch. Read the model card, copy a partner adapter’s defaults, ship. A week later you find out reasoning_effort=high doubled cost for no quality gain, max_tokens=2048 silently truncated half your tier-3 runs, and the “prompt-rich” pattern you copied from grok-4.3 actively hurts kimi.

Advanced GitHub Actions Patterns#

Once you understand the basics of GitHub Actions, these patterns solve the real-world problems: testing across multiple environments, authenticating to cloud providers without static secrets, building reusable action components, and scaling runners.

Matrix Builds#

Test across multiple OS versions, language versions, or configurations in parallel:

jobs:
  test:
    strategy:
      fail-fast: false
      matrix:
        os: [ubuntu-latest, macos-latest]
        go-version: ['1.22', '1.23']
    runs-on: ${{ matrix.os }}
    steps:
      - uses: actions/checkout@v4
      - uses: actions/setup-go@v5
        with:
          go-version: ${{ matrix.go-version }}
      - run: go test ./...

This creates 4 jobs (2 OS x 2 Go versions) running in parallel. Set fail-fast: false so a failure in one combination does not cancel the others – you want to see all failures at once.