k3s because it has been around for a while, and it's something I have used almost since it was first made available. Yes cluster upgrades are covered with the

k3s because it has been around for a while, and it's something I have used almost since it was first made available. Yes cluster upgrades are covered with the "upgrade" command, as described in the REAME. I use the Rancher's System Upgrade Controller for this, which makes rolling upgrades very easy and super quick. Github Actions is perfectly fine, it's what I use both for personal stuff and at work. For the database, are you planning to host it in Kubernetes? Depending on the database type there may be an operator that can handle backups easily for you. For example for Postgres I have used the Zalando operator which does this and there is a newer one called CloudNativePG which might be even better. What kind of databases are they?