Update cmake.yml

Author: Gogoshika-ga

.github/workflows/cmake.yml

@@ -64,6 +64,19 @@ jobs:
       with:
         submodules: true
 
+    - name: Install Clang 18 (Linux)
+      if: matrix.os == 'ubuntu-22.04'
+      run: |
+        sudo apt update
+        sudo apt install -y wget lsb-release software-properties-common gnupg
+        wget https://apt.llvm.org/llvm.sh
+        chmod +x llvm.sh
+        sudo ./llvm.sh 18 all
+        sudo update-alternatives --install /usr/bin/clang clang /usr/bin/clang-18 100
+        sudo update-alternatives --install /usr/bin/clang++ clang++ /usr/bin/clang++-18 100
+        clang-18 --version
+        clang++-18 --version
+
     - name: Set reusable strings
       # Turn repeated input strings (such as the build output directory) into step outputs. These step outputs can be used throughout the workflow file.
       id: strings