Ruby container (#10)

* Add Ruby folder

* Add Ruby agent Dockerfile

src/ruby/Dockerfile

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+# To build one auto-instrumentation image for Ruby, please:
+# - Ensure the packages are installed in the `/instrumentation` directory. This is required as when instrumenting the pod,
+#   one init container will be created to copy all the content in `/instrumentation` directory to your app's container.
+# - Grant the necessary access to `/instrumentation` directory. `chmod -R go+r /instrumentation`
+
+FROM ruby:latest AS build
+WORKDIR /operator-build
+
+# Install gems from Gemfile into the `workspace` directory
+ADD Gemfile .
+RUN BUNDLE_PATH=workspace bundle install
+
+FROM busybox
+
+# Copy build artifacts from previous
+COPY --from=build /operator-build /operator-build
+WORKDIR /operator-build
+
+# Shell command to search inside the `workspace/ruby` directory for a directory that starts with `newrelic_rpm`.
+# Example of a found result: workspace/ruby/3.2.0/gems/newrelic_rpm-9.9.0
+# Copy the result into a new directory called `/instrumentation`.
+RUN sh -c "find 'workspace/ruby/' -type d -name newrelic_rpm\\* -exec cp -r '{}' /instrumentation \\;"
+
+# Adjust permissions of `instrumentation` director to readable by everyone
+RUN chmod -R go+r /instrumentation
+
+# Clean up build artifacts
+RUN rm -rf /operator-build

src/ruby/Gemfile

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+# frozen_string_literal: true
+
+source 'https://rubygems.org'
+
+gem 'newrelic_rpm'

src/ruby/Gemfile.lock

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+# This file only exists to satisfy FOSSA security scan. It is not used.
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    newrelic_rpm (9.9.0)
+
+PLATFORMS
+  ruby
+  x86_64-darwin-23
+
+DEPENDENCIES
+  newrelic_rpm
+
+BUNDLED WITH
+   2.5.6