Improve release tagging

This converts the v0.0.4 release tag in Github to 0.0.4 for Docker image, and includes the v0.0.4 tag in the release image.

Skip struct schema validation, simplify schema

This skips Go struct schema validation to simplify the JSON schema. This means that we rely on manual checking to detect dependencies between JSON types, such as when only one of two keys may be provided.

New Amanar Features

This is the first release after a series of improvements to Amanar while its API starts to come closer to its final form.

Improvements that have been incorporated recently include:

• Ability for Amanar to output constant templates and template files
• Support for YAML, and reconfiguring the configuration format to support YAML anchors
• Refactoring Amanar to Go modules, including allowing it to be imported as a package
• Integration with Gitlab CI/CD, with new tags published to the Gitlab Container Registry
• Makes the project buildable on non-Darwin platforms so such platforms can take advantage of the non-Keychain specific functionality