Cleanup cross-namespace resources from the inventory

[bigkevmcd]

This adds a finalizer and removes the resources recorded in the inventory from the cluster.

[foot]

Tested it a bit, works great 💯 !

Only didn't work for:

• load gs[0]
• delete configmaps manually
• delete gitopsset
• gets stuck, workaround: manually delete finalizer

This is rare, I sort of got it into this state by commenting out the namespace section as below, which removed the namespaces, (and so the configmaps), but the inv still had the configmaps.

Could we check for NotFound errors coming back from Delete? Not sure thats supported there. Anyway, lgtm!

[0]

apiVersion: templates.weave.works/v1alpha1
kind: GitOpsSet
metadata:
  name: gitopsset-configmaps
  namespace: default
spec:
  generators:
    - list:
        elements:
          - env: dev
            team: dev-team
          - env: production
            team: ops-team
          - env: staging
            team: ops-team
  templates:
    # - content:
    #     kind: Namespace
    #     apiVersion: v1
    #     metadata:
    #       name: "{{ .Element.env }}"
    - content:
        kind: ConfigMap
        apiVersion: v1
        metadata:
          name: "{{ .Element.env }}-info-configmap"
          namespace: "{{ .Element.env }}"
        spec:
          data:
            team: "{{ .Element.team }}"
            env: "{{ .Element.env }}"
            description: "This is a configmap for the {{ .Element.env }} environment"