Add cmake installation to building workflow

Author: luisfpereira

.github/workflows/build.yml

@@ -23,6 +23,12 @@ jobs:
         with:
           python-version: ${{matrix.python-version}}
 
+      - name: Install CMake (Ubuntu-only)
+        if: matrix.os == 'Ubuntu'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y cmake
+
       - name: Installing [pip]
         run: |
           pip install --upgrade pip