Support existingSecrets

[brsolomon-deloitte]

It would be nice to allow chart users to specify an existingSecret for htpasswd as well as a handful of other Secrets that are currently either auto-generated or required to supply a value directly. (Admittedly, htpasswd is hashed, but it is still not ideal to keep the hashed value in Git.)

See some great examples in the various bitnami helm charts.

[WoodyWoodsta]

I'm looking for this too. I want the password to be randomly generated on deployment using a Job, but with the actual file contents being required at chart compile time, this is not possible.

[circular-rodrigo]

I also think this would be a good feature

[Gridness]

I've implemented the feature in #186 , you can check it out and bump it :)