Mask dockerconfigjson secret types and support StringData secrets

If implemented, flux diff kustomization will managed correctly sops
managed dockerconfigjson secrets.
Sops encrypted secret with stringData maps are supported too.

Signed-off-by: Soule BA <soule@weave.works>

cmd/flux/testdata/diff-kustomization/diff-with-deployment.golden

@@ -1,4 +1,6 @@
 ► HorizontalPodAutoscaler/default/podinfo created
 ► Service/default/podinfo created
+► Secret/default/docker-secret created
+► Secret/default/secret-basic-auth-stringdata created
 ► Secret/default/podinfo-token-77t89m9b67 created
 ► Secret/default/db-user-pass-bkbd782d2c created

cmd/flux/testdata/diff-kustomization/diff-with-dockerconfigjson-sops-secret.golden

@@ -0,0 +1,6 @@
+► Deployment/default/podinfo created
+► HorizontalPodAutoscaler/default/podinfo created
+► Service/default/podinfo created
+► Secret/default/secret-basic-auth-stringdata created
+► Secret/default/podinfo-token-77t89m9b67 created
+► Secret/default/db-user-pass-bkbd782d2c created

cmd/flux/testdata/diff-kustomization/diff-with-drifted-key-sops-secret.golden

@@ -1,6 +1,8 @@
 ► Deployment/default/podinfo created
 ► HorizontalPodAutoscaler/default/podinfo created
 ► Service/default/podinfo created
+► Secret/default/docker-secret created
+► Secret/default/secret-basic-auth-stringdata created
 ► Secret/default/podinfo-token-77t89m9b67 drifted
 
 data

cmd/flux/testdata/diff-kustomization/diff-with-drifted-secret.golden

@@ -1,6 +1,8 @@
 ► Deployment/default/podinfo created
 ► HorizontalPodAutoscaler/default/podinfo created
 ► Service/default/podinfo created
+► Secret/default/docker-secret created
+► Secret/default/secret-basic-auth-stringdata created
 ► Secret/default/podinfo-token-77t89m9b67 created
 ► Secret/default/db-user-pass-bkbd782d2c drifted
 

cmd/flux/testdata/diff-kustomization/diff-with-drifted-service.golden

@@ -7,5 +7,7 @@ spec.ports.http.port
     - 9899
     + 9898
 
+► Secret/default/docker-secret created
+► Secret/default/secret-basic-auth-stringdata created
 ► Secret/default/podinfo-token-77t89m9b67 created
 ► Secret/default/db-user-pass-bkbd782d2c created

cmd/flux/testdata/diff-kustomization/diff-with-drifted-value-sops-secret.golden

@@ -1,4 +1,6 @@
 ► Deployment/default/podinfo created
 ► HorizontalPodAutoscaler/default/podinfo created
 ► Service/default/podinfo created
+► Secret/default/docker-secret created
+► Secret/default/secret-basic-auth-stringdata created
 ► Secret/default/db-user-pass-bkbd782d2c created

cmd/flux/testdata/diff-kustomization/diff-with-stringdata-sops-secret.golden

@@ -0,0 +1,6 @@
+► Deployment/default/podinfo created
+► HorizontalPodAutoscaler/default/podinfo created
+► Service/default/podinfo created
+► Secret/default/docker-secret created
+► Secret/default/podinfo-token-77t89m9b67 created
+► Secret/default/db-user-pass-bkbd782d2c created

cmd/flux/testdata/diff-kustomization/dockerconfigjson-sops-secret.yaml

@@ -0,0 +1,11 @@
+apiVersion: v1
+data:
+  .dockerconfigjson: eyJtYXNrIjoiKipTT1BTKioifQ==
+kind: Secret
+metadata:
+  labels:
+    kustomize.toolkit.fluxcd.io/name: podinfo
+    kustomize.toolkit.fluxcd.io/namespace: {{ .fluxns }}
+  name: docker-secret
+  namespace: default
+type: kubernetes.io/dockerconfigjson

cmd/flux/testdata/diff-kustomization/nothing-is-deployed.golden

@@ -1,5 +1,7 @@
 ► Deployment/default/podinfo created
 ► HorizontalPodAutoscaler/default/podinfo created
 ► Service/default/podinfo created
+► Secret/default/docker-secret created
+► Secret/default/secret-basic-auth-stringdata created
 ► Secret/default/podinfo-token-77t89m9b67 created
 ► Secret/default/db-user-pass-bkbd782d2c created

cmd/flux/testdata/diff-kustomization/stringdata-sops-secret.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  labels:
+    kustomize.toolkit.fluxcd.io/name: podinfo
+    kustomize.toolkit.fluxcd.io/namespace: {{ .fluxns }}
+  name: secret-basic-auth-stringdata
+  namespace: default
+stringData:
+  password: KipTT1BTKio=
+  username: KipTT1BTKio=
+type: kubernetes.io/basic-auth