Add option to 'generate' cmd to generate Docker file

[jeevatkm]

Goal of generate command - increases productivity and helps developer on tedious tasks during application development. It generates boilerplate code, configuration files and complement scripts, etc.

# For example to generate `docker` file
aah generate script --name docker --importpath github.com/user/appname

# Short form
aah g s -n docker -i github.com/user/appname

# If you're on app path
aah g s -n systemd

aah has automated build process for Docker Image creation. Supported Docker tags are -

• aahframework/aah:latest - Latest production release.
• aahframework/aah:{version} - Specific release version, for e.g.: aahframework/aah:v0.9.
• aahframework/aah:edge - Latest development edge version.

This command generates two docker files -

• Dockerfile.dev - For development usage with aah docker image.
• Dockerfile.prod - Using Multistage-build to create very small docker image for production purpose. More info, refer to https://docs.docker.com/develop/develop-images/multistage-build/.

• Implementation
• Documentation

[jeevatkm]

Done 😄