Refactor packages migrations to make it work with both PG and MySQL [ci skip]

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

config/initializers/mysql_set_length_for_binary_indexes.rb → config/initializers/mysql_set_length_for_binary_and_text_indexes.rb

-# This patches ActiveRecord so indexes for binary columns created using the
-# MySQL adapter apply a length of 20. Otherwise MySQL can't create an index on
-# binary columns.
+# This patches ActiveRecord so indexes for binary and text columns created
+# using the MySQL adapter apply a length of 20. Otherwise MySQL can't create an
+# index on binary and text columns.
 
-module MysqlSetLengthForBinaryIndex
+module MysqlSetLengthForBinaryAndTextIndex
   def add_index(table_name, column_names, options = {})
     Array(column_names).each do |column_name|
       column = ActiveRecord::Base.connection.columns(table_name).find { |c| c.name == column_name }
 
-      if column&.type == :binary
+      if column&.type == :binary || column&.type == :text
         options[:length] = 20
       end
     end
@@ -17,5 +17,5 @@ module MysqlSetLengthForBinaryIndex
 end
 
 if defined?(ActiveRecord::ConnectionAdapters::Mysql2Adapter)
-  ActiveRecord::ConnectionAdapters::Mysql2Adapter.send(:prepend, MysqlSetLengthForBinaryIndex)
+  ActiveRecord::ConnectionAdapters::Mysql2Adapter.send(:prepend, MysqlSetLengthForBinaryAndTextIndex)
 end

ee/db/migrate/20180720120716_create_packages_packages.rb

@@ -8,8 +8,12 @@ class CreatePackagesPackages < ActiveRecord::Migration
 
   def change
     create_table :packages_packages, id: :bigserial do |t|
+      t.references :project,
+        index: true,
+        foreign_key: { on_delete: :cascade },
+        null: false
+
       t.timestamps_with_timezone null: false
-      t.references :project, index: true, foreign_key: { on_delete: :cascade }, null: false
 
       t.string :name, null: false
       t.string :version

ee/db/migrate/20180720120726_create_packages_package_files.rb

@@ -8,11 +8,11 @@ class CreatePackagesPackageFiles < ActiveRecord::Migration
 
   def up
     create_table :packages_package_files, id: :bigserial do |t|
+      t.references :package, type: :bigint, index: true, null: false
+
       t.timestamps_with_timezone null: false
 
       t.bigint :size
-
-      t.references :package, index: true, null: false
       t.integer :file_type
       t.integer :file_store
       t.binary :file_md5

ee/db/migrate/20180720121404_create_packages_maven_metadata.rb

@@ -8,8 +8,9 @@ class CreatePackagesMavenMetadata < ActiveRecord::Migration
 
   def up
     create_table :packages_maven_metadata, id: :bigserial do |t|
+      t.references :package, type: :bigint, index: true, null: false
+
       t.timestamps_with_timezone null: false
-      t.references :package, index: true, null: false
 
       t.string :app_group, null: false
       t.string :app_name, null: false