DEV: Add initial structure for migrations-tooling

migrations/convert

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+#!/usr/bin/env ruby
+# frozen_string_literal: true

migrations/import

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+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+puts "Loading application..."
+require_relative "../config/environment"
+
+module Migrations
+  module Import
+    class << self
+      def run
+        puts "Importing into Discourse #{Discourse::VERSION::STRING}"
+      end
+    end
+  end
+end
+
+Migrations::Import.run

migrations/spec/import_spec.rb

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+# frozen_string_literal: true
+
+RSpec.describe "Migrations::Import" do
+  subject(:cli) { system "migrations/import" }
+
+  it "works" do
+    expect { cli }.to output(
+      include("Importing into Discourse #{Discourse::VERSION::STRING}"),
+    ).to_stdout_from_any_process
+  end
+end