Docker image, GitHub CI and more

[adyanth]

I have made a handful of changes to automate builds, make things a bit more configurable, add a license (I noticed your UI had MIT, but the backend did not have any) remove branding and analytics, mostly for the purpose of hosting it locally or for ad-hoc debugging. This may or may not be helpful for you, so I will let this be here as reference. Feel free to close this issue if you do not need this.

https://github.com/jbowens/request-catcher/compare/master...adyanth:request-catcher:main