Move to unified linting

Signed-off-by: Joas Schilling <coding@schilljs.com>

.github/workflows/lint-eslint.yml

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+# 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
+
+name: Lint
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - stable*
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    name: eslint
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Read package.json node and npm engines version
+        uses: skjnldsv/read-package-engines-version-actions@v1.1
+        id: versions
+        with:
+          fallbackNode: '^12'
+          fallbackNpm: '^6'
+
+      - name: Set up node ${{ steps.versions.outputs.nodeVersion }}
+        uses: actions/setup-node@v2
+        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
+        run: npm ci
+
+      - name: Lint
+        run: npm run lint

.github/workflows/lint-info-xml.yml

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+# 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
+
+name: Lint
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - stable*
+
+jobs:
+  xml-linters:
+    runs-on: ubuntu-latest
+
+    name: info.xml lint
+    steps:
+      - name: Checkout
+        uses: actions/checkout@master
+
+      - name: Download schema
+        run: wget https://raw.githubusercontent.com/nextcloud/appstore/master/nextcloudappstore/api/v1/release/info.xsd
+
+      - name: Lint info.xml
+        uses: ChristophWurst/xmllint-action@v1
+        with:
+          xml-file: ./appinfo/info.xml
+          xml-schema-file: ./info.xsd

.github/workflows/lint-php-cs.yml

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+# 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
+
+name: Lint
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - stable*
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    name: php-cs
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up php ${{ matrix.php-versions }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: "7.4"
+          coverage: none
+
+      - name: Install dependencies
+        run: composer i
+
+      - name: Lint
+        run: composer run cs:check || ( echo 'Please run `composer run cs:fix` to format your code' && exit 1 )

.github/workflows/lint-php.yml

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+# 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
+
+name: Lint
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - stable*
+
+jobs:
+  php-lint:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        php-versions: ["7.3", "7.4", "8.0"]
+
+    name: php-lint
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up php ${{ matrix.php-versions }}
+        uses: shivammathur/setup-php@v2
+        with:
+          php-version: ${{ matrix.php-versions }}
+          coverage: none
+
+      - name: Lint
+        run: composer run lint
+
+  summary:
+    runs-on: ubuntu-latest
+    needs: php-lint
+
+    if: always()
+
+    name: php-lint-summary
+
+    steps:
+      - name: Summary status
+        run: if ${{ needs.php-lint.result != 'success' && needs.php-lint.result != 'skipped' }}; then exit 1; fi

.github/workflows/lint-stylelint.yml

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+# 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
+
+name: Lint
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+      - stable*
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    name: stylelint
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Read package.json node and npm engines version
+        uses: skjnldsv/read-package-engines-version-actions@v1.1
+        id: versions
+        with:
+          fallbackNode: '^12'
+          fallbackNpm: '^6'
+
+      - name: Set up node ${{ steps.versions.outputs.nodeVersion }}
+        uses: actions/setup-node@v2
+        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
+        run: npm ci
+
+      - name: Lint
+        run: npm run stylelint