feat: add plain zot credentials for crane

gitea-runner/manifests/zot-plain-secret.yaml

@@ -0,0 +1,22 @@
+apiVersion: external-secrets.io/v1
+kind: ExternalSecret
+metadata:
+  name: zot-registry-credentials-plain
+  namespace: gitea
+spec:
+  refreshInterval: 1h
+  secretStoreRef:
+    kind: ClusterSecretStore
+    name: vault-backend
+  target:
+    name: zot-registry-credentials-plain
+    creationPolicy: Owner
+  data:
+    - secretKey: username
+      remoteRef:
+        key: zot
+        property: USERNAME
+    - secretKey: password
+      remoteRef:
+        key: zot
+        property: PASSWORD