* feat: Add new tests for insecure registries.
* chore: Refactor code into parseImageOptions and add tests.
* feat: normalizeRegistryAddress supports http addresses.
* feat: keys of authConfigs are now stored without protocol.
* chore: Refactor of docker registry fallback in parseImageOptions.
* refactor: Improve tests and implementation of parseImageOptions
* feat: Implement support for http registries.
* fix: authConfig unit tests now reflect newest structure.
* fix: docker_image_registry data source can pull without authentication.
* fix: Refactor setup of http headers for registry requests.
* docs: Add note about http registries.
* docs: Fix linting error in docs.
