Add Docker support

[dsebastien]

[zachjamesgreen]

What support would be needed for docker? would you want to create a docker image that doesnt use yeoman but a dockerfile? I would like to help you with this issue.

[dsebastien]

Hello @zachjamesgreen

I wanted to include a way to quickly be able to create a Docker image from:

• the dev version (i.e., w/ sourcemaps, etc)
• the production version

I actually implementing something in an older project, but it needs some reviewing and improvements I think. Here's what I had that we could take inspiration from:

• https://github.com/dsebastien/midnightLightV2/blob/master/Dockerfile
• https://github.com/dsebastien/midnightLightV2/blob/master/DockerfileDev
• https://github.com/dsebastien/midnightLightV2/blob/master/runDevOnDocker.sh
• https://github.com/dsebastien/midnightLightV2/blob/master/runOnDocker.sh
• https://github.com/dsebastien/modernWebDevGenerator/blob/master/app/templates/projectFiles/.dockerignore

Some issues there:

• dockerfiles
  • we should probably enforce a specific nodejs version to avoid surprises
  • the list of globally installed packages in the image could be shorter
  • the TypeScript version should be retrieved from tsconfig.json
  • the run commands should reuse scripts defined in package.json
  • the CMD command should be "npm" "start" rather than "gulp" "serve"
  • needs some documentation
• the shell scripts that create the images were made on Windows, that might not necessarily work on *nix / OSX

Any further ideas are welcome :)