Add helm options for config, pullPolicy and apiGroups

[tyrken]

I had to make some changes to the helm chart to get it usable in our cluster, including control over the bits needed from the external values file.

Note I had to define a non-empty displayContext also, to avoid getting stuck in a redirect loop, not sure if this a bug or not.

Sorry my auto-formatting editor has put in a bunch of whitespace fixups, hope you don't mind them included...

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @tyrken to sign the Salesforce.com Contributor License Agreement.

[giovannirco]

I am glad you fixed the ingress indentation, I was about to push a PR for that but I also have had some other issues with the ingress, I wonder if it worked fine for you

[tyrken]

Sorry didn't use the ingress (I proxy via https://github.com/buzzfeed/sso with it's own ingress) - but if your other issues were an infinite redirect I did get that until I added a non-empty displayContext.

Doing so in this PR is a bit of a fudge but not sure how best to "fix"

sloop/pkg/sloop/webserver/webserver.go

Line 211 in 14ae23c

server.mux.HandleFunc("/", redirectHandler(config.CurrentContext))

[sana-jawad]

Can we change it to IfNotPresent?

[sana-jawad]

Thanks a lot @tyrken for the contribution. Overall the change looks good. Just added a small comment.

[tyrken]

Done @sana-jawad