pypi workflow (google-deepmind/mctx)

The pypi workflow from google-deepmind/mctx, explained and optimized by Latchkey.

What it does

This is the pypi workflow from the google-deepmind/mctx repository, a real project running GitHub Actions. It is shown here with attribution under its Apache-2.0 license.

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

The workflow

name: pypi

on:
  release:
    types: [created]

jobs:
  deploy:
    runs-on: ubuntu-latest
    permissions:
      id-token: write
    steps:
    - uses: actions/checkout@v4
    - name: Set up Python
      uses: actions/setup-python@v4
      with:
        python-version: '3.x'
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install setuptools wheel twine build
    - name: Check consistency between the package version and release tag
      run: |
        pip install .
        RELEASE_VER=${GITHUB_REF#refs/*/}
        PACKAGE_VER="v`python -c 'import mctx; print(mctx.__version__)'`"
        if [ $RELEASE_VER != $PACKAGE_VER ]
        then
          echo "package ver. ($PACKAGE_VER) != release ver. ($RELEASE_VER)"; exit 1
        fi
    - name: Build and publish
      run: |
        python -m build
    - name: Publish package distributions to PyPI
      uses: pypa/gh-action-pypi-publish@release/v1

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: pypi
 
on:
  release:
    types: [created]
 
jobs:
  deploy:
    timeout-minutes: 30
    runs-on: latchkey-small
    permissions:
      id-token: write
    steps:
    - uses: actions/checkout@v4
    - name: Set up Python
      uses: actions/setup-python@v4
      with:
        cache: 'pip'
        python-version: '3.x'
    - name: Install dependencies
      run: |
        python -m pip install --upgrade pip
        pip install setuptools wheel twine build
    - name: Check consistency between the package version and release tag
      run: |
        pip install .
        RELEASE_VER=${GITHUB_REF#refs/*/}
        PACKAGE_VER="v`python -c 'import mctx; print(mctx.__version__)'`"
        if [ $RELEASE_VER != $PACKAGE_VER ]
        then
          echo "package ver. ($PACKAGE_VER) != release ver. ($RELEASE_VER)"; exit 1
        fi
    - name: Build and publish
      run: |
        python -m build
    - name: Publish package distributions to PyPI
      uses: pypa/gh-action-pypi-publish@release/v1
 

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.
• 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.

1 third-party action is referenced by a movable tag. Pin it to the commit SHA (Latchkey resolves and applies this automatically) so a repointed tag cannot change what runs.

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

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

Actions used in this workflow