Implement deployment commands

[gplanchat]

As a developer I want to deploy my application on an environment, should it be local or remote, be able to synchronize the files I have in local and the ones on the remote environment.

Commands to add:

• environment:init Asks questions about the location (server/directory) of the remote environment, environment variables to set and writes them inside a .kloud.environment.yaml file in the local workspace.
• environment:deploy integrates https://deployer.org to deploy the application in the remote environment:
  • rsync the sources
  • build the Docker infrastructure through docker-compose up --no-start
• environment:destroy that integrates https://deployer.org to destroy the application in the remote environment:
  • destroy the Docker infrastructure through docker-compose down and delete the appropriate persistent volumes
  • delete the sources and the directory
• environment:start that integrates https://deployer.org to start the application in the remote environment, should fail if the application wasn't previously deployed
• environment:stop that integrates https://deployer.org to stop the application in the remote environment, should fail if the application wasn't previously deployed
• environemnt:cache:clear that integrates https://deployer.org to clear the application caches and restart the FPM servcie(s)
• environment:rsync that synchronizes the local and remote sources (in case you switched from git branches)
• environment:database:dump that dumps the database in the current state
• environment:database:load that loads a database dump
• environment:variable:get that prints the value of an environment variable
• environment:variable:set that changes the value of an environment variable
• environment:variable:list that prints the values of all environment variables
• environment:variable:unset that unsets an environment variable
• environment:proxy that proxies a port in the stack to a local port (especially for Xdebug and database accesses)
• environment:shell that opens a shell in a node of the execution environment (be it sh, sh-xdebug or sql nodes)