feat: add ruby server example

[hanshal101]

Fixes buildsafedev/bsf#96
Closes buildsafedev/bsf#96

Description

This PR adds the Ruby Server Example for buildsafe.

Note

• Since buildsafe currently does not officially ruby, there is an alternate way to build and push the application, i.e

# to develop
bsf develop

# to push with tags (optional)
bsf oci pkgs --tag=dev --push

• To get inside the development shell and perform some actions as a developer

# to get inside development shell
bsf develop

# to checkout installed ruby version
ruby -v

# to install rails
gem install rails

[hanshal101]

Hey @dr-housemd @rakshitgondwal there was some issue with my git inside the wsl, so I created a new PR for this issue!