(PA-4863) Create vanagon skeleton

.gitignore

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+vendor/*
+output/*
+.bundle
+gems
+Gemfile.local
+Gemfile.lock
+*.log
+ext
+pkg
+*.swp

Gemfile

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+source ENV['GEM_SOURCE'] || "https://rubygems.org"
+
+def location_for(place)
+  if place =~ /^((?:git[:@]|https:)[^#]*)#(.*)/
+    [{ :git => $1, :branch => $2, :require => false }]
+  elsif place =~ /^file:\/\/(.*)/
+    ['>= 0', { :path => File.expand_path($1), :require => false }]
+  else
+    [place, { :require => false }]
+  end
+end
+
+gem 'artifactory'
+gem 'vanagon', *location_for(ENV['VANAGON_LOCATION'] || '~> 0.36')
+gem 'packaging', *location_for(ENV['PACKAGING_LOCATION'] || '~> 0.109')
+gem 'rake', '~> 13.0'
+
+eval_gemfile("#{__FILE__}.local") if File.exist?("#{__FILE__}.local")

Rakefile

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+require 'json'
+
+begin
+  require 'packaging'
+  Pkg::Util::RakeUtils.load_packaging_tasks
+rescue LoadError => e
+  puts "Error loading packaging rake tasks: #{e}"
+end