feat: dynamic sidebar content

[misohu]

Related to this jira task and this feature

In kubeflow-dashboard-operator there is a sidebar relation with the src/extra_config.json. In order to add element to the sidebar proper relation needs to be established. After the relation is set, charms fills the config for given app-name from src/extra_config.json and reloads the configmap. Currently supporting (juju application names)

• katib-ui for katib
• tensorboards-web-app for tesorboard

Sidebar element is removed after the relation is broken.

[github-actions]

Libraries are not up to date with their remote counterparts. If this was
not intentional, run charmcraft fetch-libs and commit the updated libs
to your PR branch.

stdout

Library charms.grafana_k8s.v0.grafana_dashboard updated to version 0.13.
Library charms.prometheus_k8s.v0.prometheus_scrape updated to version 0.20.

stderr

[DnPlas]

Thanks @misohu