Install cmake [run ci]

Author: spenke91

.github/workflows/tests_cmake_t8code_w_other_compilers.yml

@@ -63,6 +63,9 @@ jobs:
         fetch-depth: 0
     - name: Update packages
       run: apt-get update && apt-get upgrade -y
+    - name: Install missing packages (to be added to image)
+      run: |
+        apt-get install -y cmake
     # - name: Install some basic packages
     #   run: |
     #     apt-get install -y wget tar lld make \