feat: add ruby server example

ruby-server-example/.gitignore

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+
+bsf-result/

ruby-server-example/Dockerfile

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+# Ruby Alpine image (after using bsf dockerfile digest)
+FROM ttl.sh/ruby-server:dev AS build
+
+# Expose the application port
+EXPOSE 9898
+
+# Command to run the Ruby application
+CMD ["ruby", "main.rb"]

ruby-server-example/Gemfile

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+source 'https://rubygems.org'
+
+gem 'activesupport', '~> 7.0'

ruby-server-example/README.md

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+This is an Example Ruby repo
+
+## Install nix
+```
+curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install
+
+```
+
+```
+To get started using Nix, open a new shell or run `. /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh`
+```
+You can experiment if the installation was successful by runing `nix run "nixpkgs#hello"`
+## Install bsf cli 
+nix profile install {{URL}}
+
+
+## Initialize the projct
+Now is the time to run `bsf init` which will generate the `bsf.hcl` and `bsf.locl` files. It also generates a bsf folder with all nix files requred to build the project. 
+
+## Add files before building 
+`git add . ` <- Required by nix sandboxing.
+
+## Develop the porject
+This will get you in the development shell of your application
+`bsf develop`
+
+## Interact with the project
+You can checkout the ruby version
+`ruby -v`
+Try to install rails
+`gem install rails`
+
+## Create a base image with Ruby dependencies and using it the Dockerfile
+```Dockerfile
+# Ruby Alpine image (after using bsf dockerfile digest)
+FROM ttl.sh/ruby-server AS build
+
+# Install all required dependencies for Ruby gems
+RUN apk add --no-cache build-base libxml2-dev libxslt-dev tzdata
+
+WORKDIR /src
+
+# Copy the Gemfile and Gemfile.lock into the container
+COPY Gemfile Gemfile.lock /src/
+
+# Install the required gems
+RUN bundle install
+
+# Copy the rest of the application files to the container
+COPY . /src
+
+# Expose the application port
+EXPOSE 9898
+
+# Command to run the Ruby application
+CMD ["ruby", "main.rb"]
+```
+
+Lets build this image
+`docker build -t ttl.sh/ruby-server:dev`
+
+Now Run the image
+`docker run -d -p 9898:9898 ttl.sh/ruby-server:dev`
+
+## Checkout your application
+`curl localhost:9898/ping` here the response should be `Pong!`

ruby-server-example/bsf.hcl

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+
+packages {
+  development = ["[email protected]", "[email protected]", "ruby@~3.3.4", "bundler@~2.5.16"]
+  runtime     = ["[email protected]"]
+}
+
+oci "pkgs" {
+  name          = "ttl.sh/ruby-server"
+  layers        = ["split(packages.runtime)", "split(packages.dev)"]
+  isBase        = true
+  cmd           = []
+  entrypoint    = []
+  envVars       = []
+  exposedPorts  = []
+  importConfigs = []
+}