CI: Workaround for MoltenVK crash

1.2.10 and later crash during descriptor set creation. So for now let's stick with the older version

.github/workflows/build.yml

@@ -239,7 +239,17 @@ jobs:
     - name: "Install system dependencies"
       run: |
         brew update
-        brew install llvm@15 ninja nasm molten-vk automake libtool
+        brew install llvm@15 ninja nasm automake libtool
+        brew install cmake python3 ninja
+
+    - name: "Build and install molten-vk"
+      run: |
+        git clone https://github.com/KhronosGroup/MoltenVK.git
+        cd MoltenVK
+        git checkout bf097edc74ec3b6dfafdcd5a38d3ce14b11952d6
+        ./fetchDependencies --macos
+        make macos
+        make install
 
     - name: "Setup cmake"
       uses: jwlawson/actions-setup-cmake@v2