CI: Add pre-commit hook for XML schema validation

.pre-commit-config.yaml

@@ -64,16 +64,6 @@ repos:
         files: ^core/extension/gdextension_interface\.json$
         args: ["--schemafile", "core/extension/gdextension_interface.schema.json"]
 
-  ### Requires Docker; look into alternative implementation.
-  # - repo: https://github.com/comkieffer/pre-commit-xmllint.git
-  #   rev: 1.0.0
-  #   hooks:
-  #     - id: xmllint
-  #       language: docker
-  #       types_or: [text]
-  #       files: ^(doc/classes|.*/doc_classes)/.*\.xml$
-  #       args: [--schema, doc/class.xsd]
-
   - repo: local
     hooks:
       - id: make-rst
@@ -99,6 +89,13 @@ repos:
         pass_filenames: false
         files: ^(gles3|glsl)_builders\.py$
 
+      - id: validate-xml
+        name: validate-xml
+        language: python
+        entry: python misc/scripts/validate_xml.py
+        files: ^(doc/classes|.*/doc_classes)/.*\.xml$
+        additional_dependencies: [xmlschema]
+
       - id: eslint
         name: eslint
         language: node