feat: check manifests against schema (#1965)

.github/workflows/check-schema.yml

@@ -0,0 +1,16 @@
+name: Check Schema
+
+on:
+  pull_request:
+    paths:
+      - 'index/**.toml'
+
+jobs:
+  check:
+    uses: ./.github/workflows/check-with-script.yml
+    with:
+      name: Schema
+      script: check-schema.sh
+      script_arg: alire/schemas/manifest-schema.yaml
+      setup_python: true
+      fetch_schema: true

.github/workflows/check-with-script.yml

@@ -20,11 +20,22 @@ on:
         required: false
         type: boolean
         default: false
+      setup_python:
+        description: Whether to set up Python and install requirements.txt
+        required: false
+        type: boolean
+        default: false
+      fetch_schema:
+        description: Whether to clone the Alire repo (manifest JSON Schema)
+        required: false
+        type: boolean
+        default: false
 
 env:
   CHECKS_ORG: alire-project
   CHECKS_REPO: alire-index-checks
   ALR_VERSION: 2.1.1
+  SCHEMA_REPO: https://github.com/alire-project/alire
 
 jobs:
   check:
@@ -51,6 +62,22 @@ jobs:
       with:
         version: ${{env.ALR_VERSION}}
 
+    - name: Set up Python
+      if: inputs.setup_python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.12'
+
+    - name: Install Python dependencies
+      if: inputs.setup_python
+      run: pip install -r ${{env.CHECKS_REPO}}/requirements.txt
+      shell: bash
+
+    - name: Fetch manifest schema
+      if: inputs.fetch_schema
+      run: git clone --depth 1 "$SCHEMA_REPO" alire
+      shell: bash
+
     - name: Run check
       run: >
         ${{env.CHECKS_REPO}}/scripts/${{inputs.script}}