Install CMake for build

.forgejo/workflows/build.yaml

@@ -10,6 +10,10 @@ jobs:
     steps:
       - name: Check out the code
         uses: actions/checkout@v4
+      - name: Install the toolchain
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install cmake
       - name: Set up the build environment
         run: cmake .
       - name: Compile the code