Cleaned up workflow file

.github/workflows/ci_tests.yml

@@ -40,22 +40,11 @@ jobs:
         python3 -c 'import numpy as np; print(np.get_include())'
 
     - name: Workaround - install CMake 3.25.2 since 3.26.0 doesn't work
+      # Normally we would install cmake with the package manager, but
+      # ubuntu 20.04 doesn't seems to keep older versions of cmake around...
+      # Fortunately, there exists a pip package
       run: |
         python3 -m pip install cmake==3.25.2
-      #run: |
-      #  sudo apt remove cmake
-      #  sudo apt purge --auto-remove cmake
-      #  wget http://www.cmake.org/files/v3.25/cmake-3.25.2.tar.gz
-      #  tar xf cmake-3.25.2.tar.gz
-      #  cd cmake-3.25.2
-      #  ./configure
-      #  make
-      #  sudo make install
-      #  hash -r
-      #  cd -
-
-    - name: Show CMake version
-      run: |
         cmake --version
 
     - name: configure