(maint) Add the ec2 provider to our prod-all-providers Gemfile

this will allow to build a prod image that includes the ec2 code

Author: Samuel Beaulieu

docker/prod-all-providers/Gemfile

@@ -1,5 +1,6 @@
 source ENV['GEM_SOURCE'] || 'https://rubygems.org'
 
 gem 'vmpooler',                    '~> 2.4'
+gem 'vmpooler-provider-ec2',       '~> 0.0.1'
+gem 'vmpooler-provider-gce',       '~> 0.4'
 gem 'vmpooler-provider-vsphere',   '~> 1.6'
-gem 'vmpooler-provider-gce',       '~> 0.3'