A new Docker image template has been added to the .goreleaser.yaml file. Specifically, the image template 'wneessen/apg-go' was introduced under the 'dockers' configuration, allowing smoother configuration for Docker-based implementations.
This commit introduces the .gitignore configuration file and adds SPDX headers to several files including test and documentation files. The headers provide license information in a standardized format which can be easily picked up by automated tools for license compliance checks. Additionally, it deleted a .idea/.gitignore file, which is a project specific IDE configuration file not necessary for the repository. It also introduced a README.md file providing more insightful information about the project.
