ci(actions): Add workflow to lint info.xml

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

@@ -0,0 +1,40 @@
+# 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 info.xml
+
+on: pull_request
+
+permissions:
+  contents: read
+
+concurrency:
+  group: lint-info-xml-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  xml-linters:
+    runs-on: ubuntu-latest-low
+
+    name: info.xml lint
+    steps:
+      - name: Checkout
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+          sparse-checkout: |
+            appinfo/
+
+      - name: Download schema
+        run: wget -O info.xsd https://raw.githubusercontent.com/nextcloud/server/refs/heads/master/resources/app-info-shipped.xsd
+
+      - name: Lint info.xml
+        uses: ChristophWurst/xmllint-action@36f2a302f84f8c83fceea0b9c59e1eb4a616d3c1 # v1.2
+        with:
+          xml-file: ./appinfo/info.xml
+          xml-schema-file: ./info.xsd