[Feature] Add apps from Weaveworks

[alexellis]

Description

I'd like to see the following, if it makes sense on a case-by-case basis:

• Flux CD (now CNCF) - https://fluxcd.io
• Helm Operator (in CNCF repo, but still a Weaveworks project) - https://github.com/fluxcd/helm-operator
• Weave scope - https://www.weave.works/oss/scope/ and https://github.com/helm/charts/tree/master/stable/weave-scope
• Flagger by @stefanprodan - we have an Istio app now with the settings from Flagger, not sure if Gloo will also be required?

Anything else from the Weave team?

[alexellis]

Help wanted from Weaveworks folks.. @stefanprodan @stealthybox perhaps?

[aidun]

@alexellis as discussed in slack I start working on it. I will start with the helm operator.

[stefanprodan]

@aidun I would start with Flux, the helm operator should use the SSH key generated by Flux so users don't have to add two deployment keys to the same repo.