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name: Frontend a11y regression gate
# Reusable workflow called from build.yml when frontend sources change.
#
# Scans the stories this branch touches in real Chromium and runs axe against
# each; the check fails on any axe violation, or on a story that fails to render
# at all.
#
# Only changed stories, because a full sweep is ~30 minutes: far too slow to sit
# in front of every merge. The whole suite is scanned nightly instead
# (nightly.yml), which catches anything a branch didn't touch.
on:
workflow_call:
permissions:
contents: read
jobs:
frontend-a11y:
runs-on: ubuntu-latest
timeout-minutes: 25
steps:
- name: Harden Runner
uses: step-security/harden-runner@05e31511f85b41b11d1cf0ef85d0992719546e2c # v2.21.0
with:
egress-policy: audit
- name: Checkout repository
uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
with:
# Need the base branch too, to diff against it.
fetch-depth: 0
- name: Set up Node.js
uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
with:
node-version: "22"
cache: "npm"
cache-dependency-path: frontend/package-lock.json
- name: Install Task
uses: go-task/setup-task@a00fbb05ce67b35648be3c78cbc9fd85354c757e # v2.2.0
- name: a11y gate (changed stories)
run: task frontend:storybook:a11y:changed -- origin/${{ github.base_ref || 'main' }}
- name: Upload scan reports
# The reports carry the offending selector and help text for each
# violation; without them a red run can only be understood by
# reproducing the whole scan locally.
if: always()
uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
with:
name: a11y-scan-${{ github.run_id }}
path: frontend/.a11y-scan/
retention-days: 7
if-no-files-found: ignore
# The reports live in a dot-directory, which upload-artifact treats as
# hidden and silently skips by default.
include-hidden-files: true