Helm Chart: allow configuring WOPI proof keys

[wkloucek]

Is your feature request related to a problem?

I would like to configure WOPI proof keys when deploying Collabora with the Helm Chart maintained in this repository.

Describe the solution you'd like

Probably it makes sense to have the proof key in a secret, so that it can be mounted in all Collabora pods

Describe alternatives you've considered

Generate the proof key during runtime and store it in a RWX volume. But this should be avoided since makes Collabora require RWX storage now (which it doesn't have right now).

Additional context

This is what I came across when reading about Collabora and WOPI proof keys: https://www.collaboraonline.com/blog/how-to-wopi-binding-for-collabora-online-in-sharepoint-2016-server/

[wkloucek]

I'd also be willing to contribute code when we agree that adding a ConfigMap is the right way.

[Darshan-upadhyay1110]

Hello @wkloucek

I'd also be willing to contribute code when we agree that adding a ConfigMap is the right way.

Sure

CC: @Rash419 @timar

[Rash419]

Describe the solution you'd like

Probably it makes sense to have the proof key in a secret, so that it can be mounted in all Collabora pods

@wkloucek looks like a great idea. Go ahead! Let me know if you need any help. Thanks