Hercules-effects support

[Mic92]

Started in #68

[zowoq]

@Mic92 How you you plan to handle secrets? Separate secrets file for each repo or just one secret file per instance like hercules?

[Mic92]

Ideally one per repository if I can make it secure. Maybe each repository gets a public key for encryption.

[zowoq]

I forgot to ask about the GitToken secret, it is a short lived token from the github app set by the hercules backend.

Possible that some repos may not even need to set secrets if they had this token as it could be used for pushing to the repo, pages, releases, etc.