Codecov upload workflow (oegedijk/explainerdashboard)

The Codecov upload workflow from oegedijk/explainerdashboard, explained and optimized by Latchkey.

What it does

This is the Codecov upload workflow from the oegedijk/explainerdashboard 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: Codecov upload
on:
  push:
    branches:
      - 'master'
jobs:
  codecov:
    name: Codecov Workflow
    runs-on: ubuntu-24.04
    
    steps:
      - uses: actions/checkout@v1
      - name: Set up Python
        uses: actions/setup-python@v2
        id: setup-python
        with:
          python-version: 3.11
      - name: Install uv
        uses: astral-sh/setup-uv@v1
        with:
          uv-version: 'latest'
      - name: Cache uv global directory
        uses: actions/cache@v4
        with:
          path: ${{ env.UV_CACHE_DIR }}
          key: ${{ runner.os }}-uv-3.11-${{ hashFiles('**/pyproject.toml') }}
          restore-keys: |
            ${{ runner.os }}-uv-3.11-
      - name: Generate coverage report
        run: |
          # Install project with test dependencies (includes pytest and pytest-cov)
          uv pip install ".[test]" --system
          pytest --cov=./ --cov-report=xml
      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v1
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          file: ./coverage.xml
          flags: unittests

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: Codecov upload
on:
  push:
    branches:
      - 'master'
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true
 
jobs:
  codecov:
    timeout-minutes: 30
    name: Codecov Workflow
    runs-on: latchkey-small
    
    steps:
      - uses: actions/checkout@v1
      - name: Set up Python
        uses: actions/setup-python@v2
        id: setup-python
        with:
          cache: 'pip'
          python-version: 3.11
      - name: Install uv
        uses: astral-sh/setup-uv@v1
        with:
          uv-version: 'latest'
      - name: Cache uv global directory
        uses: actions/cache@v4
        with:
          path: ${{ env.UV_CACHE_DIR }}
          key: ${{ runner.os }}-uv-3.11-${{ hashFiles('**/pyproject.toml') }}
          restore-keys: |
            ${{ runner.os }}-uv-3.11-
      - name: Generate coverage report
        run: |
          # Install project with test dependencies (includes pytest and pytest-cov)
          uv pip install ".[test]" --system
          pytest --cov=./ --cov-report=xml
      - name: Upload coverage to Codecov
        uses: codecov/codecov-action@v1
        with:
          token: ${{ secrets.CODECOV_TOKEN }}
          file: ./coverage.xml
          flags: unittests
 

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.

2 third-party actions are referenced by a movable tag. Pin them 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