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Argus
Argus is a lightweight monitor to notify of new software releases via Gotify/Slack/other messages and/or WebHooks.
Take a look at Argus. I use it to monitor the application version (not a container tag). I get notifications via mailrise (SMTP gateway for apprise) which then go to Gotify and Discord. I have webhooks setup to run scripts so I can approve the update from the Argus app to automate the update. You can also have it set to auto approve.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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https://crazymax.dev/diun/ could check for new containers for you
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https://github.com/renovatebot/renovate or https://github.com/dependabot if you using git for your configuration
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You could try some commandline tool like skopeo to fetch the image tags regularly and do some shell magic to notify you on any change you want