Add github actions for image building & support for nginx proxy configuration in env variable

[starsoccer]

So this adds github actions that auto publishes 2 images for each change one for the proxy, and one for the mono app. The one caveat and we make way to tweak this is that the branch name is used for all tags so master branch will produce an image called master and then master-proxy

On top of this I also added the ability to set the proxy pass location. I am not sure how widely used this will be but currently I am running both containers on unraid outside docker compose and internal routing by container name does not work. So this just gives some more flexibility

[CLAassistant]

All committers have signed the CLA.

[starsoccer]

Just force pushed some changes just amending the commits to hopefully match up to my github user per the above CLA Assistant

[starsoccer]

@rwagoner Any word on getting this PR merged?

[starsoccer]

@rwagoner Bump again on getting this merged? Id rather have a single repo be the source of truth and not have to fork and make my own version and keep maintaining things