Update dependencies and add pipelines (#2)

* Update Ruby/Rails/other deps
* Unlock Rails and tie to master
  * Gain access to 7.1 incoming feature allowing CI without secret_key_base
* Use Rails 7.1 Dockerfile
* Pipeline for some merge checks
* Pipeline to deploy

Reviewed-on: #2

Gemfile

@@ -3,7 +3,8 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
 ruby "3.2.0"
 
-gem "rails", "7.0.4.2"
+# unti 7.1 is out
+gem "rails", git: "https://github.com/rails/rails"
 gem "sprockets-rails"
 gem "sqlite3"
 gem "puma"