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AFAIK, for a long they were pretty hostile and there's still this webpage which asks a $45 wire transfer in order to receive a CD with open source components used in the routerOS: https://mikrotik.com/downloadterms.html
That might have changed now, but I still can't find an official repo. You could look for older versions like this: https://github.com/robimarko/routeros-GPL or try to contact them directly (or sue if you think you have a standing).
> Would be nice to keep your complete config in git or the config management widget of your choice (often Puppet or Ansible).
I did this with my (mostly) OpenWrt-based network: https://github.com/kwesthaus/network-config.
I chose the NanoPi R4S instead of the R6S as my router since it is fully supported by vanilla OpenWrt [1] whereas the R6S is still in the works [2].
[1]: https://openwrt.org/toh/friendlyarm/nanopi_r4s_v1