Feat imagelist snapshot

[abellonioandrea]

Description

Adding new method for imagelist creation. With this edit is now possibile to use instacesnapshots for populating an imagelist.

This PR is related to project 5 of cloudprog course ay 2025-26 (#1141).

[kingmakerbot]

Hi @abellonioandrea. Thanks for your PR.

I am @kingmakerbot.
You can interact with me issuing a slash command in the first line of a comment.
Currently, I understand the following commands:

• /rebase: Rebase this PR onto the master branch
• /merge: Merge this PR into the master branch
• /hold: Adds hold label to prevent merging with /merge
• /unhold: Removes the hold label to allow merging with /merge
• /deploy-staging: Deploy a staging environment to test this PR (the build-all flag enables user environments building)
• /undeploy-staging: Manually undeploy the staging environment

Make sure this PR appears in the CrownLabs changelog, adding one of the following labels:

• kind/breaking: 💥 Breaking Change
• kind/feature: 🚀 New Feature
• kind/bug: 🐛 Bug Fix
• kind/cleanup: 🧹 Code Refactoring
• kind/docs: 📝 Documentation

[abellonioandrea]

/deploy-staging

[kingmakerbot]

Your staging environment has been correctly deployed.
You can access the application frontend and Qlkube APIs using the following URLs:

• Frontend: https://1172.staging.ng.crownlabs.polito.it/app/
• Qlkube GraphQL API: https://1172.staging.ng.crownlabs.polito.it/graph/
  Operators: possibly add the crownlabs.polito.it/operator-selector=staging-1172 label to desired tenants.