I know I always can run docker command explicitly to build any fancy env I want. But I feel helper script should provide better support for common usage.

1. fuzzer developing.
   When developing fuzzer, I may need to modify build script, fuzzer code, and sometimes the library code. In the past, /src is shared, I can run editor outside the docker in one terminal while run build script in another terminal. The development cycle is fast.

   Now the /src is not shared. If I need to modify fuzzer code, I need to either install/setup my editor inside docker (inconvenient) or run full build_fuzzers script (slow).

   If I need to tweak the library code, although I can edit inside the docker, I need to think how to send the diff to outside of docker.

   I don't know what is the best solution. I feel it may be good idea to add --mount DIR option (which add -v $DIR:/mnt to docker command line) to the helper script. Then I can sync my work between inside and outside of docker.

2. debugging support
   I know this doc. It would be great that helper script supports it natively.