Automate releases of Grafana Agent Operator Helm chart

[rfratto]

We should find a way to automate the releases of our Grafana Agent Operator Helm chart like @rlankfo did for the Homebrew formulas. The releases of the Grafana Agent Helm chart are automated, but not the one for the operator.

cc @captncraig

[captncraig]

I was planning to add it to the grafana helm charts repo: https://github.com/grafana/helm-charts That automatically makes a helm release when the code there is updated. The only automation on our end is bumping the app version and the chart version, which can be done with our drone over on this end.

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[jeroenlandheer]

Probably related to this: Grafana Loki charts uses Grafana-Agent-Operator as a sub-chart. This sub-chart is outdated (v0.25.1) and should be updated. v0.25.1 has several vulnerabilities (28 in the agent, 22 in the operator.) according to our Trivy scanner.