Sign the grafana cloud version of this plugin.

[zoltrain]

Feature Request

Is your feature request related to a problem? Please describe.
Currently the published version on this package on grafana.com isn't signed so it won't do a signature check before installing. You also receive warnings about it being insecure.

Describe the solution you'd like
Sign the plugin, it looks pretty easy. https://grafana.com/docs/grafana/latest/developers/plugins/sign-a-plugin/

Teachability, Documentation, Adoption, Migration Strategy
They will be able to install this plugin and have confidence the file contents of the zip haven't changed.

[zoltrain]

Sorry duplicate of #286