Initial setup for dependabot-docker

docker/.rubocop.yml

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+inherit_from: ../config/rubocop-default.yml

docker/Gemfile

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+# frozen_string_literal: true
+
+source "https://rubygems.org"
+
+gem "dependabot-core", path: "../"
+
+gemspec

docker/README.md

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+## `dependabot-docker`
+
+Docker support for [`dependabot-core`][core-repo].
+
+### Running locally
+
+1. Install Ruby dependencies
+   ```
+   $ bundle install
+   ```
+
+2. Run tests
+   ```
+   $ bundle exec rspec spec
+   ```
+
+[core-repo]: https://github.com/dependabot/dependabot-core

docker/dependabot-terraform.gemspec

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+# frozen_string_literal: true
+
+require "find"
+
+Gem::Specification.new do |spec|
+  core_gemspec = Bundler.load_gemspec_uncached("../dependabot-core.gemspec")
+
+  spec.name         = "dependabot-docker"
+  spec.summary      = "Terraform support for dependabot-core"
+  spec.version      = core_gemspec.version
+  spec.description  = core_gemspec.description
+
+  spec.author       = core_gemspec.author
+  spec.email        = core_gemspec.email
+  spec.homepage     = core_gemspec.homepage
+  spec.license      = core_gemspec.license
+
+  spec.require_path = "lib"
+  spec.files        = []
+
+  spec.required_ruby_version = core_gemspec.required_ruby_version
+  spec.required_rubygems_version = core_gemspec.required_ruby_version
+
+  spec.add_dependency "dependabot-core", Dependabot::VERSION
+
+  core_gemspec.development_dependencies.each do |dep|
+    spec.add_development_dependency dep.name, dep.requirement.to_s
+  end
+
+  next unless File.exist?("../.gitignore")
+
+  ignores = File.readlines("../.gitignore").grep(/\S+/).map(&:chomp)
+
+  next unless File.directory?("lib") && File.directory?("helpers")
+
+  prefix = "/" + File.basename(File.expand_path(__dir__)) + "/"
+  Find.find("lib", "helpers") do |path|
+    if ignores.any? { |i| File.fnmatch(i, prefix + path, File::FNM_DOTMATCH) }
+      Find.prune
+    else
+      spec.files << path unless File.directory?(path)
+    end
+  end
+end

docker/spec/spec_helper.rb

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+# frozen_string_literal: true
+
+def common_dir
+  @common_dir ||= Gem::Specification.find_by_name("dependabot-core").gem_dir
+end
+
+def require_common_spec(path)
+  require "#{common_dir}/spec/dependabot/#{path}"
+end
+
+require "#{common_dir}/spec/spec_helper.rb"