Disable ccache in ci

Author: oowekyala

.github/workflows/build_and_test.yml

@@ -52,6 +52,7 @@ jobs:
       - name: Build LLVM
         run: |
           source .venv/bin/activate
+          export LLVM_CMAKE_OPTIONS='-DLLVM_CCACHE_BUILD=OFF'
           .github/workflows/build-llvm.sh -reconfigure -verbose
 
       - name: Save llvm cache