Add template workflow to check for problems with MkDocs-based website

On every push or pull request that affects the source and configuration for the repository's MkDocs-based static
website, build the site and fail if any problems were encountered.

Author: per1234

workflow-templates/assets/check-mkdocs-task/Taskfile.yml

@@ -0,0 +1,11 @@
+# See: https://taskfile.dev/#/usage
+version: "3"
+
+tasks:
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-mkdocs-task/Taskfile.yml
+  website:check:
+    desc: Check whether the MkDocs-based website will build
+    deps:
+      - task: poetry:install-deps
+    cmds:
+      - poetry run mkdocs build --strict

workflow-templates/check-mkdocs-task.md

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+# "Check Website" workflow (MkDocs, Task)
+
+Workflow file: [check-mkdocs-task.yml](check-mkdocs-task.yml)
+
+Check for problems with a [MkDocs](https://www.mkdocs.org/)-based static website.
+
+This is the version of the workflow for projects using the [Task](https://taskfile.dev/#/) task runner tool.
+
+## Installation
+
+See [the "Deploy Website" (MkDocs, Poetry) workflow documentation](deploy-mkdocs-poetry.md#installation)
+
+## Assets
+
+- [`Taskfile.yml`](assets/check-yaml-task/Taskfile.yml] - Build task.
+  - Install to: repository root (or add the `website:build` task into the existing `Taskfile.yml`)
+- [`Taskfile.yml`](assets/shared/Taskfile.yml] - Installation task.
+  - Add the `poetry:install-deps` task into the existing `Taskfile.yml`
+- Website assets - See [the "Deploy Website" (MkDocs, Poetry) workflow documentation](deploy-mkdocs-poetry.md#assets).
+
+## Readme badge
+
+Markdown badge:
+
+```markdown
+[![Check Website status](https://github.com/REPO_OWNER/REPO_NAME/actions/workflows/check-mkdocs-task.yml/badge.svg)](https://github.com/REPO_OWNER/REPO_NAME/actions/workflows/check-mkdocs-task.yml)
+```
+
+Replace the `REPO_OWNER` and `REPO_NAME` placeholders in the URLs with the final repository owner and name ([example](https://raw.githubusercontent.com/arduino-libraries/ArduinoIoTCloud/master/README.md)).
+
+---
+
+Asciidoc badge:
+
+```adoc
+image:https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-mkdocs-task.yml/badge.svg["Check Website status", link="https://github.com/{repository-owner}/{repository-name}/actions/workflows/check-mkdocs-task.yml"]
+```
+
+Define the `{repository-owner}` and `{repository-name}` attributes and use them throughout the readme ([example](https://raw.githubusercontent.com/arduino-libraries/WiFiNINA/master/README.adoc)).
+
+## Commit message
+
+```
+Add CI workflow to check for problems with MkDocs-based website
+
+On every push or pull request that affects the source and configuration for the repository's MkDocs-based static
+website, build the site and fail if any problems were encountered.
+```
+
+## PR message
+
+```markdown
+On every push or pull request that affects the source and configuration for the repository's [MkDocs](https://www.mkdocs.org/)-based static website, build the site and fail if any problems were encountered.
+```

workflow-templates/check-mkdocs-task.yml

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+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-mkdocs-task.md
+name: Check Website
+
+# See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/check-mkdocs-task.ya?ml"
+      - "Taskfile.ya?ml"
+      - "mkdocs.ya?ml"
+      - "poetry.lock"
+      - "pyproject.toml"
+      - "docs/**"
+  pull_request:
+    paths:
+      - ".github/workflows/check-mkdocs-task.ya?ml"
+      - "Taskfile.ya?ml"
+      - "mkdocs.ya?ml"
+      - "poetry.lock"
+      - "pyproject.toml"
+      - "docs/**"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.9"
+
+      - name: Install Poetry
+        run: pip install poetry
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Build website
+        run: task website:check

workflow-templates/dependabot/workflow-template-copies/.github/workflows/check-mkdocs-task.yml

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+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-mkdocs-task.md
+name: Check Website
+
+# See: https://docs.github.com/en/actions/reference/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/check-mkdocs-task.ya?ml"
+      - "Taskfile.ya?ml"
+      - "mkdocs.ya?ml"
+      - "poetry.lock"
+      - "pyproject.toml"
+      - "docs/**"
+  pull_request:
+    paths:
+      - ".github/workflows/check-mkdocs-task.ya?ml"
+      - "Taskfile.ya?ml"
+      - "mkdocs.ya?ml"
+      - "poetry.lock"
+      - "pyproject.toml"
+      - "docs/**"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Install Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.9"
+
+      - name: Install Poetry
+        run: pip install poetry
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Build website
+        run: task website:check