Implement Github bot for repo-info synchronization

[olemis]

It should work similar to snyk bot .

• [ ] Move drip.sh to new scripts folder
• [ ] Implement this in cmd/repoinfobot folder
• [ ] HTTP endpoint for connecting to Docker Hub / Cloud (or alike) web hooks
• [ ] Schedule cron job to scrape target image.
• [ ] Create branch with changes detected after scraping metadata
• [ ] Submit PR if differences found

If possible language = python .

[stdevPavelmc]

In the research steps to this issue I see two ways of triggering the updates:

1. Webhooks, it get triggered on any main repo update on Docker Hub (master branch) for all main docker images. (efficient and clean)
2. Daily cron job, check if the info has changed on daily bases (crude & resource wasting)

Any of them need a permanent & defined VPS instance to run, or a docker instance with dind on it.

This two are basically mutually exclusive to avoid duplicate triggering. I will go in the Webhooks way as it's more versatile and must be reused.