Integrate Harbor or at least provide instructions/charts

[berndtj]

Currently we use artifactory (private and requires vmware network) or docker hub for function images. This is less than ideal, especially if users don't want the function images public. Also, we create a LOT of function images (1 to 1). It would be great to be able to point to a repo deployed with or along side dispatch (harbor for instance).

[berndtj]

This is just to support a docker compatible repository, not harbor specifically