ci: attempt to use the older ubuntu cmake

#30

Author: cwsmith

.github/workflows/cmake.yml

@@ -22,6 +22,11 @@ jobs:
       security-events: write
 
     steps:
+    - name: Install CMake
+      run: |
+        sudo apt-get update -yq
+        sudo apt-get install -yq cmake
+
     - name: Install mpi
       run: |
         sudo apt-get update -yq