feat(openshift-image-registry): Add intial config for s3 based registry

This patch adds the credentials needed for the image registry to the
cluster as well as the config to adjust to instruct the operator to use
it.

clusters/okd4/openshift-image-registry/cluster-config.yaml

+apiVersion: imageregistry.operator.openshift.io/v1
+kind: Config
+metadata:
+  name: cluster
+  annotations:
+    kustomize.toolkit.fluxcd.io/prune: disabled
+spec:
+  managementState: Managed
+  storage:
+    managementState: Unmanaged
+    s3:
+      bucket: si-okd-registry
+      region: eu-central-003
+      regionEndpoint: s3.eu-central-003.backblazeb2.com
+      virtualHostedStyle: false

clusters/okd4/openshift-image-registry/s3-credentials.yaml

+apiVersion: v1
+kind: Secret
+metadata:
+    name: image-registry-private-configuration-user
+    namespace: openshift-image-registry
+type: Opaque
+data:
+    REGISTRY_STORAGE_S3_ACCESSKEY: ENC[AES256_GCM,data:FVP4wUXXmdicHDct7RSmvEBo3/JSVroRiS6vjg9/PKGMuZ44,iv:YvoQSTREyfTiRA0yjZuGNuFk9g9RPcBhyf4IuXseK3s=,tag:yEPbv4eWXGtuw9Oi8gm8RQ==,type:str]
+    REGISTRY_STORAGE_S3_SECRETKEY: ENC[AES256_GCM,data:X6W0etxDCWK8fdxOcsT0RLylpgws41R6z+oYM4Ep/yD7qDCwGILhgb8pGY8=,iv:2yWHZaDq+1B9Y1Dvlc87ZS8dEM4OpR+owM66YPjDipQ=,tag:035WiPMu8DsqR7s4oDS8vA==,type:str]
+sops:
+    kms: []
+    gcp_kms: []
+    azure_kv: []
+    hc_vault: []
+    age: []
+    lastmodified: "2021-08-13T22:56:30Z"
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+          enc: |
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+          fp: 9D02A9AD73EF7F3D5F657AC2B392F6EB325E8C50
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+          enc: |-
+            -----BEGIN PGP MESSAGE-----
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+    encrypted_regex: ^(data|stringData)$
+    version: 3.7.1