[Merge Generator] Using pair of different match keys

[Vladyslav-Miletskyi]

Hi,
First of all, awesome idea and great job with ApplicationSet!

I would like to use merge Generator with cluster and git generators, as matching keys I would like to use cluster's name and path[0] keys. Correct me if I'm wrong, currently it is not possible to match values of 2 different keys.

Setup

added argocd clusters

• cluster1
• cluster2
• cluster3

GitRepo structure

cluster1/
  deployments/
    NS1/
    NS2/
cluster3/
  deployments/
    test/

Expected result (at least part of it)

- cluster: cluster1
  path: cluster1/deployments/NS1
- cluster: cluster1
  path: cluster1/deployments/NS2
- cluster: cluster3
  path: cluster3/deployments/test