ci: Explicitly disable Metal on non-metal tests

Signed-off-by: mudler <[email protected]>

Author: mudler

.github/workflows/test.yaml

@@ -46,7 +46,7 @@ jobs:
         run: go version
       - name: Test
         run: |
-          CMAKE_ARGS="-DLLAMA_F16C=OFF -DLLAMA_AVX512=OFF -DLLAMA_AVX2=OFF -DLLAMA_FMA=OFF" make test
+          CMAKE_ARGS="-DLLAMA_METAL=OFF -DLLAMA_F16C=OFF -DLLAMA_AVX512=OFF -DLLAMA_AVX2=OFF -DLLAMA_FMA=OFF" make test
 
   macOS-metal-latest:
     runs-on: macOS-latest