text: Title: [QUESTION] docker build on ARM
  Body: Hi,
  
  didn't want to file a bug report for this, because I'm sure it is not a bug per se, but rather an issue relating to architecture.
  
  I wanted to try whoogle on a Raspberry Pi, running Raspbian (an ARM version of Debian). I tried starting a Docker container, but that did not work because the code is compiled for x64, not ARM.
  
  So then I tried a docker build (using the command as instructed on your webpage). That fails to build though. It fails trying to make _cffi_backend.o, because it cannot find the header file ffi.h.
  I see that the -I for gcc is both /usr/include/ffi and /usr/include/libffi. I have libffi-dev installed, but both of those paths do not exist on my system. My system does have ffi.h, it's in /usr/include/arm-linux-gnueabihf/
  
  So two questions:
  - Do you plan to include armv71 builds?
  - What do I need to change to make the docker build look in the right place?
  
  Any hints are appreciated!
  
  Thanks!
  
  