Updated the build even more

[bruvv]

Made an extra build that runs every night, gets the current ENV CHROMECASTGOVERSION=v0.3.1 from the dockfile and compares it with the remote version using the github api. If there is a new version, it will make a new dockerfile, adjust it with sed and push a new image.

Do note: It will NOT update the Dockerfile in the repo (for ophious reasons).

Also added a healtcheck from this "issue": https://github.com/nichobi/sponsorblockcast/issues/29

[bruvv]

@nichobi ping

[nichobi]

Apologies for the delay, merging now