Offer docker images for all builded architectures

You build your rcon-cli for different architectures. You could also build docker images for all of those architecture. Or at least start with: linux_armv7, linux_arm64 and linux_386.

Start by inspecting how the repository currently builds rcon-cli for different architectures and whether it has an existing Docker configuration. Verify the approach against linux_armv7, linux_arm64, and linux_386, with done meaning Docker images are available for each requested architecture.

Written by the indexing model from the issue text.