feat(ci): Add prettier CI workflow

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

.github/workflows/lint-prettier.yml

@@ -0,0 +1,91 @@
+# SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-License-Identifier: MIT
+
+name: Lint prettier
+
+on: pull_request
+
+permissions:
+  contents: read
+
+concurrency:
+  group: lint-prettier-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  changes:
+    runs-on: ubuntu-latest
+
+    outputs:
+      src: ${{ steps.changes.outputs.src}}
+
+    steps:
+      - uses: dorny/paths-filter@de90cc6fb38fc0963ad72b210f1f284cd68cea36 # v3.0.2
+        id: changes
+        continue-on-error: true
+        with:
+          filters: |
+            src:
+              - '.github/workflows/**'
+              - 'lib/**'
+              - 'appinfo/info.xml'
+              - 'package.json'
+              - 'package-lock.json'
+              - 'tsconfig.json'
+              - '.prettierignore'
+              - '**.js'
+              - '**.ts'
+              - '**.vue'
+              - '**.yml'
+              - '**.md'
+
+  lint:
+    runs-on: ubuntu-latest
+
+    needs: changes
+    if: needs.changes.outputs.src != 'false'
+
+    name: NPM format
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+
+      - 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@60edb5dd545a775178f52524783378180af0d1f8 # v3
+        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
+          PUPPETEER_SKIP_DOWNLOAD: true
+        run: npm ci
+
+      - name: Format
+        run: npm run format
+
+  summary:
+    permissions:
+      contents: none
+    runs-on: ubuntu-latest
+    needs: [changes, lint]
+
+    if: always()
+
+    # This is the summary, we just avoid to rename it so that branch protection rules still match
+    name: prettier
+
+    steps:
+      - name: Summary status
+        run: if ${{ needs.changes.outputs.src != 'false' && needs.lint.result != 'success' }}; then exit 1; fi

.prettierignore

@@ -10,6 +10,9 @@
 # Compiled JS output
 js/
 
+# Handled by transifex
+l10n/
+
 # PHP
 lib/
 **/*.php