Added diagnostics to my GitHub Actions workflow to debug why mpmath p…

…ackage is not found.

.github/workflows/astronomy-engine-tests.yml

@@ -20,7 +20,7 @@ jobs:
       with:
         python-version: '3.10'
     - name: Install Python tools
-      run: python -m pip install --upgrade pip && pip install mypy mpmath
+      run: python -m pip install --upgrade pip && pip install mypy mpmath && pip show mpmath && echo PYTHONPATH=$PYTHONPATH && python -c "import sys; print('sys.path =', sys.path)"
     - name: Install documentation tools Linux
       if: startsWith(matrix.os, 'ubuntu')
       run: sudo apt install -y doxygen xsltproc cppcheck