feat: centralize info.xml lint workflow

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

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+# SPDX-FileCopyrightText: 2021-2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+# SPDX-License-Identifier: MIT
+
+name: Lint info.xml
+
+on:
+  workflow_call:
+
+permissions:
+  contents: read
+
+jobs:
+  xml-linters:
+    name: info.xml lint
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+          sparse-checkout: |
+            appinfo/
+
+      - name: Download schema
+        run: >-
+          wget
+          https://raw.githubusercontent.com/nextcloud/appstore/c8fe8dcb388d2ed7b566e982fd64aa38463ba80a/nextcloudappstore/api/v1/release/info.xsd
+
+      - name: Lint info.xml
+        uses: ChristophWurst/xmllint-action@36f2a302f84f8c83fceea0b9c59e1eb4a616d3c1 # v1.2
+        with:
+          xml-file: ./appinfo/info.xml
+          xml-schema-file: ./info.xsd

workflow-templates/lint-info-xml.properties.json

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+{
+  "name": "Lint info.xml",
+  "description": "Validate a Nextcloud app's appinfo/info.xml against the App Store schema.",
+  "iconName": "octicon codescan",
+  "categories": [
+    "XML"
+  ],
+  "filePatterns": [
+    "^appinfo/info.xml$"
+  ]
+}

workflow-templates/lint-info-xml.properties.json.license

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+SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+SPDX-License-Identifier: AGPL-3.0-or-later

workflow-templates/lint-info-xml.yml

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+# SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# This workflow is published through the LibreCode organization catalog.
+# Implementation: LibreCodeCoop/github-workflows
+
+name: Lint info.xml
+
+on: pull_request
+
+permissions:
+  contents: read
+
+jobs:
+  lint-info-xml:
+    uses: LibreCodeCoop/github-workflows/.github/workflows/lint-info-xml.yml@c5f578281fa7d270b839866ebc07047287ff50d8