Support individual intervals

[gmuellerinform]

Is your feature request related to a problem? Please describe.

I want my local registry to be polled every 30 seconds, so pushes from CI/CD are quickly applied.

Describe the solution you'd like

Scan for label like com.centurylinklabs.watchtower.interval=30s and use this interval for this container only.

Describe alternatives you've considered

Start second watchtower instance

Additional context

No response

[github-actions]

Hi there! 👋🏼 As you're new to this repo, we'd like to suggest that you read our code of conduct as well as our contribution guidelines. Thanks a bunch for opening your first issue! 🙏

[bujesse]

I'd like to see this feature as well. My use case is some containers are more important to be updated more regularly than others. For example, I want Authelia to be updated at least nightly to bring in the latest security patches. But for other containers I favor stability, such as Grafana which I only want to update maybe weekly

Agree it seems canonical to piggy back off of the labels functionality currently only used to include/exclude containers at all.