feat(content): ruby hello world (#103)

Author: thomas-tacquet

README.md

@@ -76,6 +76,7 @@ Table of Contents:
 | **[Terraform NGINX hello world](containers/terraform-nginx-hello-world/README.md)** <br/> A minimal example running the base NGINX image in a serverless container deployed with Terraform. | N/A          | [Terraform]            |
 | **[Triggers with Terraform](containers/terraform-triggers/README.md)** <br/> Configuring two SQS triggers, used to trigger two containers, one public, one private.                         | N/A          | [Terraform]            |
 | **[gRPC HTTP2 in Go](containers/grpc-http2-go/README.md)** <br/> A Go gRPC Container using http2                                                                                            | Go/Protobuf  | [CLI]                  |
+| **[Ruby Hello World](containers/ruby-hello-world/)** <br/> A simple Ruby Hello world Container                                                                                              | Ruby         | [CLI]                  |
 
 ### ⚙️ Jobs
 

containers/ruby-hello-world/Dockerfile

@@ -0,0 +1,17 @@
+# Use the official Ruby image from the Docker Hub
+FROM ruby:3.4.4
+
+# Set the working directory in the container
+WORKDIR /app
+
+# Copy the Gemfile and Gemfile.lock into the container
+COPY Gemfile ./
+
+# Install the dependencies
+RUN bundle install && bundle add rackup puma
+
+# Copy the rest of the application code into the container
+COPY app.rb .
+
+# Run the application
+CMD ["ruby", "app.rb"]

containers/ruby-hello-world/Gemfile

@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gem 'webrick'

containers/ruby-hello-world/README.md

@@ -0,0 +1,73 @@
+# Ruby hello world
+
+This example demonstrates the deployment of a simple Ruby http service on Scaleway Serverless Containers.
+
+For this example, we will use the CLI to deploy the container, but you can use [other methods](https://www.scaleway.com/en/docs/serverless/containers/reference-content/deploy-container/).
+
+## Workflow
+
+Here are the different steps we are going to proceed:
+
+- Quick set-up of Container Registry to host our Ruby container
+- Deploy the Serverless Container
+- Test the container
+
+## Deployment
+
+### Requirements
+
+To complete the actions presented below, you must have:
+- installed and configured the [Scaleway CLI](https://www.scaleway.com/en/docs/developer-tools/scaleway-cli/quickstart/)
+- installed [Docker](https://docs.docker.com/engine/install/) to build the image
+
+### Building the image
+
+1. Run the following command in a terminal to create Container Registry namespace to store the image:
+
+    ```bash
+    scw registry namespace create name=hello-ruby
+    ```
+
+  The registry namespace information displays.
+
+1. Copy the namespace endpoint (in this case, `rg.fr-par.scw.cloud/hello-ruby`).
+
+1. Log into the Container Registry namespace you created using Docker:
+
+    ```bash
+    docker login rg.fr-par.scw.cloud/hello-ruby -u nologin --password-stdin <<< "$SCW_SECRET_KEY"
+    ```
+
+  At this point, you have correctly set up Docker to be able to push your image online.
+
+1. In a terminal, access this directory (containing the Dockerfile), and run the following command to build and tag the image:
+
+    ```bash
+    docker build --platform linux/amd64 -t rg.fr-par.scw.cloud/hello-ruby/ruby:v1 .
+    ```
+
+1. Tag and push the image to the registry namespace:
+
+    ```bash
+    docker push rg.fr-par.scw.cloud/hello-ruby/ruby:v1
+    ```
+
+### Deploying the image
+
+In a terminal, run the following command to create a Serverless Containers namespace:
+
+    ```bash
+    scw container namespace create name=hello
+    ```
+    The namespace information displays.
+
+1. Copy the namespace ID.
+
+1. Run the following command to create and deploy the container:
+
+    ```bash
+    scw container container create namespace-id=<PREVIOUS_NAMESPACE_ID> name=hello registry-image=rg.fr-par.scw.cloud/hello-ruby/ruby:v1
+    ```
+    The container information displays.
+
+1. Copy the DomainName (endpoint) to test your container, you can put the endpoint in your web browser for testing.

containers/ruby-hello-world/app.rb

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+require 'webrick'
+
+# Read the PORT environment variable, default to 8000 if not set
+port = ENV['PORT'] || 8000
+
+server = WEBrick::HTTPServer.new(Port: port.to_i)
+
+server.mount_proc '/' do |req, res|
+  res.body = "Hello from Scaleway!"
+end
+
+trap('INT') { server.shutdown }
+server.start