* Setup github actions for CI

(cherry picked from commit e894827)

* Rails 6.1 (#1352)

* Rails v6.1 compatibility (#1346)

* Fixes for rails 6.1.1

* Fixes for ruby 3.0.0

* Remove rails 5.0 support

Co-authored-by: Igor Gonchar <[email protected]>

(cherry picked from commit 1322b59)

…rated SQL strings (#1367)

* Refine when config.active_record.sqlite3.represent_boolean_as_integer is set

* Add quoting for fields in built up sql

* Remove tests for generated sql statements

These are changing with new rails versions and it's creating a lot of false failures

* Remove tests for generated sql statements using joins_left

* Fix default sort for when empty array is provided

Fixes issue with relationship requests not getting a default sort

* Add helper methods for generating sql fields with aliases and quotes

(cherry picked from commit 695bb7c)

Use underscore instead of downcase for polymorphic names

* Remove `data` from cached resource fragments

* Create a new hash using `transform_values`

Add tracking of join options for jsonapi-authorization gem
Merge related `records` in `apply_join`
Add `use_related_resource_records_for_joins` to configuration and relationships

Will fallback to deprecated class method for custom paginators derived from JSONAPI::Paginator

Deprecates content_type in favor of media_type

* [Gemfile] Add MySQL to Gemfile, for testing

* [CI] Add MySQL to CI workflow

Fixes #1456

Co-authored-by: pareeohnos <[email protected]>
Co-authored-by: Adrian Hooper <[email protected]>