Update fastbuild_6.6.66.yml

Author: cctv18

.github/workflows/fastbuild_6.6.66.yml

@@ -527,6 +527,7 @@ jobs:
           
           export CCACHE_LOGFILE="${{ github.workspace }}/kernel_workspace/ccache.log"
           export CCACHE_COMPILERCHECK="%compiler% -dumpmachine; %compiler% -dumpversion"
+          export CCACHE_BASEDIR="${{ github.workspace }}"
           export CCACHE_NOHASHDIR="true"
           export CCACHE_HARDLINK="true"
           export CCACHE_DIR="${{ env.CCACHE_DIR }}"