Add GitHub YAML checking

.pre-commit-config.yaml

@@ -1,7 +1,8 @@
+---
 default_language_version:
   python: python
 repos:
--   repo: https://github.com/pre-commit/pre-commit-hooks
+  - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.5.0
     hooks:
     - id: check-merge-conflict
@@ -13,15 +14,19 @@ repos:
       exclude: ChangeLog-spell-corrected.diff
     - id: trailing-whitespace
       exclude: ChangeLog-spell-corrected.diff
--   repo: https://github.com/pycqa/isort
+  - repo: https://github.com/pycqa/isort
     rev: 5.13.2
     hooks:
       - id: isort
         stages: [pre-commit]
--   repo: https://github.com/psf/black
+  - repo: https://github.com/psf/black
     rev: 25.11.0
     hooks:
     - id: black
       language_version: python3
       exclude: 'mathics/version.py'
       stages: [pre-commit]
+  - repo: https://github.com/python-jsonschema/check-jsonschema
+    rev: 0.31.0  # Use the latest version
+    hooks:
+      - id: check-github-workflows

pyproject.toml

@@ -67,7 +67,9 @@ Downloads = "https://github.com/Mathics3/mathics-core/releases"
 
 [project.optional-dependencies]
 dev = [
+    "check-jsonschema",
     "pexpect",
+    "pre-commit",
     "pytest",
 ]
 full = [
@@ -130,9 +132,6 @@ version = {attr = "mathics.version.__version__"}
 force_union_syntax = true
 
 [[tool.mypy.overrides]]
-module = ["mpmath", "llvmlite.*", "trepan.*"]
-ignore_missing_imports = true
-
-[[tool.mypy.overrides]]
-module = ["mathics.benchmark", "mathics.builtin.*", "mathics.eval.*", "test.*"]
+module = ["mpmath", "llvmlite.*", "trepan.*", "mathics.benchmark",
+          "mathics.builtin.*", "mathics.eval.*", "test.*"]
 ignore_errors = true