Adds a Dockerfile under the docker to package the corso binary. This currently requires the user to build the corso binary (for linux/amd64) in the build image prior to building the docker image. Follow up PRs will introduce a Makefile. Also moves the build image to the build folder and adds a couple of README.md files with instructions. Fixes #218
Corso build image
The Corso build image is a docker image that can be used to dev/test/build Corso
Creating the build image
Run build.sh to create docker.io/alcionai/base-dev
$ ./build.sh
Launching the build image
Run run_dev.sh to launch into the build image. It will mount the corso src directory at /
$ ./run_dev.sh