Migrate to Task-based workflow check system

A task is added to validate GitHub Actions workflows.

On every push and pull request that affects relevant files, this task will be executed by the GitHub Actions workflow.

The updated system makes it easy for contributors to run the same checking operation locally as will be done by the CI
system, using the Task task runner tool.

.github/workflows/check-workflows-task.yml

@@ -0,0 +1,46 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/check-workflows-task.md
+name: Check Workflows
+
+# See: https://docs.github.com/actions/using-workflows/events-that-trigger-workflows
+on:
+  push:
+    paths:
+      - ".github/workflows/*.ya?ml"
+      - "package.json"
+      - "package-lock.json"
+      - "Taskfile.ya?ml"
+  pull_request:
+    paths:
+      - ".github/workflows/*.ya?ml"
+      - "package.json"
+      - "package-lock.json"
+      - "Taskfile.ya?ml"
+  schedule:
+    # Run every Tuesday at 8 AM UTC to catch breakage resulting from changes to the JSON schema.
+    - cron: "0 8 * * TUE"
+  workflow_dispatch:
+  repository_dispatch:
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version-file: package.json
+
+      - name: Install Task
+        uses: arduino/setup-task@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          version: 3.x
+
+      - name: Validate workflows
+        run: task --silent ci:validate

README.md

@@ -6,6 +6,7 @@
 [![Check Markdown status](https://github.com/per1234/inoplatforms/actions/workflows/check-markdown-task.yml/badge.svg)](https://github.com/per1234/inoplatforms/actions/workflows/check-markdown-task.yml)
 [![Check npm status](https://github.com/per1234/inoplatforms/actions/workflows/check-npm-task.yml/badge.svg)](https://github.com/per1234/inoplatforms/actions/workflows/check-npm-task.yml)
 [![Check Prettier Formatting status](https://github.com/per1234/inoplatforms/actions/workflows/check-prettier-formatting-task.yml/badge.svg)](https://github.com/per1234/inoplatforms/actions/workflows/check-prettier-formatting-task.yml)
+[![Check Workflows status](https://github.com/per1234/inoplatforms/actions/workflows/check-workflows-task.yml/badge.svg)](https://github.com/per1234/inoplatforms/actions/workflows/check-workflows-task.yml)
 [![Spell Check status](https://github.com/per1234/inoplatforms/actions/workflows/spell-check-task.yml/badge.svg)](https://github.com/per1234/inoplatforms/actions/workflows/spell-check-task.yml)
 
 A list of all known [Arduino](http://arduino.cc) hardware packages.

Taskfile.yml

@@ -18,6 +18,7 @@ tasks:
   check:
     desc: Check for problems with the project
     deps:
+      - task: ci:validate
       - task: general:check-formatting
       - task: general:check-spelling
       - task: markdown:check-links
@@ -37,6 +38,34 @@ tasks:
       - task: markdown:fix
       - task: poetry:sync
 
+  # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-workflows-task/Taskfile.yml
+  ci:validate:
+    desc: Validate GitHub Actions workflows against their JSON schema
+    vars:
+      # Source: https://github.com/SchemaStore/schemastore/blob/master/src/schemas/json/github-workflow.json
+      WORKFLOW_SCHEMA_URL: https://json.schemastore.org/github-workflow
+      WORKFLOW_SCHEMA_PATH:
+        sh: task utility:mktemp-file TEMPLATE="workflow-schema-XXXXXXXXXX.json"
+      WORKFLOWS_DATA_PATH: "./.github/workflows/*.{yml,yaml}"
+    deps:
+      - task: npm:install-deps
+    cmds:
+      - |
+        wget \
+          --quiet \
+          --output-document="{{.WORKFLOW_SCHEMA_PATH}}" \
+          {{.WORKFLOW_SCHEMA_URL}}
+      - |
+        npx \
+          --package=ajv-cli \
+          --package=ajv-formats \
+          ajv validate \
+            --all-errors \
+            --strict=false \
+            -c ajv-formats \
+            -s "{{.WORKFLOW_SCHEMA_PATH}}" \
+            -d "{{.WORKFLOWS_DATA_PATH}}"
+
   # Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-general-formatting-task/Taskfile.yml
   general:check-formatting:
     desc: Check basic formatting style of all files