feat: implement lint stylelint action

.github/workflows/lint-stylelint.yml

@@ -0,0 +1,53 @@
+# This workflow is provided via the organization template repository
+#
+# https://github.com/nextcloud/.github
+# https://docs.github.com/en/actions/learn-github-actions/sharing-workflows-with-your-organization
+#
+# SPDX-FileCopyrightText: 2021-2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: MIT
+
+name: Lint stylelint
+
+on: pull_request
+
+permissions:
+  contents: read
+
+concurrency:
+  group: lint-stylelint-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    name: stylelint
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        with:
+          persist-credentials: false
+
+      - name: Read package.json node and npm engines version
+        uses: skjnldsv/read-package-engines-version-actions@06d6baf7d8f41934ab630e97d9e6c0bc9c9ac5e4 # v3
+        id: versions
+        with:
+          fallbackNode: "^20"
+          fallbackNpm: "^10"
+
+      - name: Set up node ${{ steps.versions.outputs.nodeVersion }}
+        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5.0.0
+        with:
+          node-version: ${{ steps.versions.outputs.nodeVersion }}
+
+      - name: Set up npm ${{ steps.versions.outputs.npmVersion }}
+        run: npm i -g 'npm@${{ steps.versions.outputs.npmVersion }}'
+
+      - name: Install dependencies
+        env:
+          CYPRESS_INSTALL_BINARY: 0
+        run: npm ci
+
+      - name: Lint
+        run: npm run stylelint

stylelint.config.js → stylelint.config.cjs

@@ -2,6 +2,6 @@
  * SPDX-FileCopyrightText: 2025 LibreCode coop and contributors
  * SPDX-License-Identifier: AGPL-3.0-or-later
  */
-import stylelintConfig from '@nextcloud/stylelint-config'
+const stylelintConfig = require('@nextcloud/stylelint-config')
 
-export { stylelintConfig }
+module.exports = stylelintConfig