feat: centralize conventional commit validation

.github/workflows/block-unconventional-commits.yml

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+# SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+# SPDX-FileCopyrightText: 2026 LibreCode coop and contributors
+# SPDX-License-Identifier: MIT
+
+name: Block unconventional commits
+
+on:
+  workflow_call:
+
+permissions:
+  contents: read
+
+concurrency:
+  group: block-unconventional-commits-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  block-unconventional-commits:
+    name: Block unconventional commits
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      - name: Validate conventional commits
+        uses: webiny/action-conventional-commits@7f91b1595ca1951cdb671ddc9f07a49081ec5b69 # v1.4.2
+        with:
+          GITHUB_TOKEN: ${{ github.token }}

workflow-templates/block-unconventional-commits.properties.json

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+{
+  "name": "Block unconventional commits",
+  "description": "Require pull request commits to follow the Conventional Commits format.",
+  "iconName": "octicon git-commit",
+  "categories": [
+    "Code Review"
+  ]
+}

workflow-templates/block-unconventional-commits.properties.json.license

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

workflow-templates/block-unconventional-commits.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: Block unconventional commits
+
+on:
+  pull_request:
+    types: [opened, ready_for_review, reopened, synchronize]
+
+permissions:
+  contents: read
+
+jobs:
+  conventional-commits:
+    uses: LibreCodeCoop/github-workflows/.github/workflows/block-unconventional-commits.yml@e2878c8c2d12d0d323116dedd2bcff37706a7eba