Dockerfile and makefile rules to build several volatility docker images.
The images share a common builder image. A generic volatility image is
used for staging. The 3 docker images that are produced have the same
layers and only differ in entrypoint definition. The images are:
* vol -- used to run plugins with vol.py
* volshell -- used to enter a volshell
* pdbconv -- used to convert pdb files to json files
The symbols used for analysis need to be provided via a defined /symbols
volume. The image used for analysis also needs to be provided via a
user-defined volume.
