Openapiipify

Fixed
- Fix Ruby publishing to handle previously built gem

Added
- Add Swaggy C configuration file

Changed
- Switch to use Swaggy C as main Makefile

Fixed
- Fix GEN_BASE_DIR passing

Fixed
- Fix package publishing GH Actions

Changed
- Use SwaggyC as a generic build script
- Upgrade OpenAPI Generator to 6.0.1

Changed
- Add generate-primary to ci and local-generate targets
- Upgrade OpenAPI Generator to 6.0.0

Added
- Add release and publish automation
- Add local-ci Makefile target

Changed
- Replace Travis CI with GH Actions
- Upgrade OpenAPI Generator version to 5.4.0
- Modify response to be content type specific