Olah GitHub Actions for Development workflow (vtuber-plan/olah)

The Olah GitHub Actions for Development workflow from vtuber-plan/olah, explained and optimized by Latchkey.

What it does

This is the Olah GitHub Actions for Development workflow from the vtuber-plan/olah repository, a real project running GitHub Actions. It is shown here with attribution under its MIT license.

Below, Latchkey shows a faster, safer version produced by its optimization engine.

The workflow

name: Olah GitHub Actions for Development
run-name: Olah GitHub Actions for Development
on:
  push:
    branches: [ "dev" ]

jobs:
  build:
    runs-on: ubuntu-latest
    strategy:
      matrix:
        python-version: ["3.9", "3.10", "3.11", "3.12"]

    steps:
      - name: Check out repository code
        uses: actions/checkout@v4
      - name: Set up Apache Arrow
        run: |
          sudo apt update
          sudo apt install -y -V ca-certificates lsb-release wget
          wget https://apache.jfrog.io/artifactory/arrow/$(lsb_release --id --short | tr 'A-Z' 'a-z')/apache-arrow-apt-source-latest-$(lsb_release --codename --short).deb
          sudo apt install -y -V ./apache-arrow-apt-source-latest-$(lsb_release --codename --short).deb
          sudo apt update
          sudo apt install -y -V libarrow-dev libarrow-glib-dev libparquet-dev libparquet-glib-dev
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          python-version: ${{ matrix.python-version }}
      - name: Install Olah
        run: |
          cd ${{ github.workspace }}
          pip install --upgrade pip
          pip install -e .
          pip install -r requirements.txt

      - name: Test Olah
        run: |
          cd ${{ github.workspace }}
          python -m pytest tests

The same workflow, on Latchkey

Estimated ~20% faster on cache hits, plus fewer wasted runs and a safer supply chain. Added and changed lines are highlighted.

name: Olah GitHub Actions for Development
run-name: Olah GitHub Actions for Development
on:
  push:
    branches: [ "dev" ]
 
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  build:
    timeout-minutes: 30
    runs-on: latchkey-small
    strategy:
      matrix:
        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
    steps:
      - name: Check out repository code
        uses: actions/checkout@v4
      - name: Set up Apache Arrow
        run: |
          sudo apt update
          sudo apt install -y -V ca-certificates lsb-release wget
          wget https://apache.jfrog.io/artifactory/arrow/$(lsb_release --id --short | tr 'A-Z' 'a-z')/apache-arrow-apt-source-latest-$(lsb_release --codename --short).deb
          sudo apt install -y -V ./apache-arrow-apt-source-latest-$(lsb_release --codename --short).deb
          sudo apt update
          sudo apt install -y -V libarrow-dev libarrow-glib-dev libparquet-dev libparquet-glib-dev
      - name: Set up Python ${{ matrix.python-version }}
        uses: actions/setup-python@v5
        with:
          cache: 'pip'
          python-version: ${{ matrix.python-version }}
      - name: Install Olah
        run: |
          cd ${{ github.workspace }}
          pip install --upgrade pip
          pip install -e .
          pip install -r requirements.txt
 
      - name: Test Olah
        run: |
          cd ${{ github.workspace }}
          python -m pytest tests
 

What changed

• Run on Latchkey managed runners with one line (runs-on), which apply the fixes below automatically and self-heal transient failures. This example uses latchkey-small; pick the runner size that fits the job.
• Cancel superseded runs when a branch or PR gets a newer push.
• Cache dependency installs on the setup step so they are served from cache.
• Add a job timeout so a hung step cannot burn hours of runner time.

What Latchkey heals here

This workflow has steps that commonly fail on transient issues (network, registries, flaky browsers). On Latchkey managed runners they are detected, retried, and self-healed instead of failing your build:

• Dependency installs
• Network fetches

This workflow runs 1 job (4 with the matrix expanded) per trigger. On Latchkey the same minutes cost up to 58% less than GitHub-hosted, with zero queue time.

Actions used in this workflow