feat: add/remove labels to resources of same kind

[AmitKumarDas]

ProblemStatement: As a SRE admin, I want to add or remove labels against resources based on resource names or resource labels

[AmitKumarDas]

Draft Design

kind: Recipe
spec:
  tasks:
  - applyLabels:
      labels:
        app: dope
      # optional include
      include:
      - node1
      - node2
      # optional exclude
      exclude:
      - node3
      state:
        kind: Node
        metadata:
          # optional label selector
          labels:
            arch: amd64

NOTE:

• step 1 - state will select all possible nodes based on its metadata.labels (if any)
• step 2 - include will filter from list due to step 1
  • if include is nil then there will not be any filtering
• step 3 - exclude will exclude from list due to step 1
  • if exclude is nil then there will not be any filtering
• include & exclude should not be used together
• final step
  • app: dope will be set against the final list
  • if step 1 list contain resource(s) with app: dope & its not present in include then app:dope will be unset from the resource