Add `--version` command and `org.opencontainers.image.version` to image

[tolik518]

There is currently no good way to see which version of the bot is running, so we need a factorion-bot --version command so it's possible to see the version (without starting the bot).

In the Dockerfile we would additionally need org.opencontainers.image.version to adhere to the standards of versioning images.