Fix SSA migration field managers

[erikgb]

This PR adapts the SSA migration code to the controller-runtime regression introduced in c/r version 0.15.0 and fixed by kubernetes-sigs/controller-runtime#2435.

/cc @inteon

[erikgb]

/retest

[inteon]

Have you tested running an old trust-manager version to confirm that the field manager is correct? I didn't do this previously but I realised that it is more important than first thought.

[erikgb]

Have you tested running an old trust-manager version to confirm that the field manager is correct? I didn't do this previously but I realised that it is more important than first thought.

Good point. With version 0.5.0 of trust-manager, I get this:

$ k get configmaps -n default example-bundle -o json --show-managed-fields=true | jq '.metadata.managedFields'
[
  {
    "apiVersion": "v1",
    "fieldsType": "FieldsV1",
    "fieldsV1": {
      "f:data": {
        ".": {},
        "f:trust-bundle.pem": {}
      },
      "f:metadata": {
        "f:ownerReferences": {
          ".": {},
          "k:{\"uid\":\"a5814f40-1e51-422c-98b4-890874ddd0b2\"}": {}
        }
      }
    },
    "manager": "trust-manager",
    "operation": "Update",
    "time": "2023-09-28T20:01:21Z"
  }
]

And with version 0.6.0 this:

$ k get configmaps -n default example-bundle -o json --show-managed-fields=true | jq '.metadata.managedFields'
[
  {
    "apiVersion": "v1",
    "fieldsType": "FieldsV1",
    "fieldsV1": {
      "f:data": {
        ".": {},
        "f:trust-bundle.pem": {}
      },
      "f:metadata": {
        "f:ownerReferences": {
          ".": {},
          "k:{\"uid\":\"03db27c7-0cf9-4ae3-a3de-ad95b9eda556\"}": {}
        }
      }
    },
    "manager": "Go-http-client",
    "operation": "Update",
    "time": "2023-09-28T20:08:27Z"
  }
]

[erikgb]

/retest

[erikgb]

/retest

[inteon]

Thanks for finding the reason we were seeing this Go-http-client name in certain older versions & for making the migration path more robust.
/approve
/lgtm

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