github-action: Update BM code path

Update the path of the BM due to the change of code folder.

Signed-off-by: Yi Sun <[email protected]>

.github/scripts/build_check

@@ -6,7 +6,7 @@ set -oe pipefail
 wpattern=" warning: "
 logfile="build.log"
 
-docker run -v "$(pwd)":/src builder make test | tee "$logfile"
+docker run -v "$(pwd)"/BM:/src builder make test | tee "$logfile"
 
 if grep "$wpattern" "$logfile"; then
   echo "==========================================="