more tutorial

examples/tutorial/hello/ruby/README.md

@@ -0,0 +1,44 @@
+## Quick Example for a Ruby Function (4 minutes)
+
+This example will show you how to test and deploy a Ruby function to Oracle Functions.
+
+```sh
+# create your func.yaml file
+fn init <YOUR_DOCKERHUB_USERNAME>/hello
+# install dependencies, we need the json gem to run this
+docker run --rm -it -v ${pwd}:/worker -w /worker funcy/ruby:dev bundle install --standalone --clean
+# build the function
+fn build
+# test it
+cat hello.payload.json | fn run
+# push it to Docker Hub
+fn push
+# Create a route to this function on Oracle Functions
+fn routes create myapp /hello
+```
+
+Now surf to: http://localhost:8080/r/myapp/hello
+
+## Dependencies
+
+Create a [Gemfile](http://bundler.io/gemfile.html) file in your function directory, then run:
+
+```sh
+docker run --rm -it -v ${pwd}:/worker -w /worker funcy/ruby:dev bundle install --standalone --clean
+```
+
+Ruby doesn't pick up the gems automatically, so you'll have to add this to the top of your `func.rb` file:
+
+```ruby
+require_relative 'bundle/bundler/setup'
+```
+
+Open `func.rb` to see it in action.
+
+To update dependencies:
+
+```sh
+docker run --rm -it -v ${pwd}:/worker -w /worker funcy/ruby:dev bundle update
+# then install again to vendor them
+docker run --rm -it -v ${pwd}:/worker -w /worker funcy/ruby:dev bundle update
+```