docs: extend docs

config/samples/supabase_v1alpha1_storage_file_backend.yaml

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+apiVersion: supabase.k8s.icb4dc0.de/v1alpha1
+kind: Storage
+metadata:
+  labels:
+    app.kubernetes.io/name: supabase-operator
+    app.kubernetes.io/managed-by: kustomize
+  name: storage-sample
+spec:
+  api:
+    fileBackend:
+      path: /tmp
+    db:
+      host: cluster-example-rw.supabase-demo.svc
+      dbName: app
+      dbCredentialsRef:
+        # will be created by Core resource operator if not present
+        # just make sure the secret name is either based on the name of the core resource or explicitly set
+        # format <core-resource-name>-db-creds-supabase-storage-admin
+        secretName: core-sample-db-creds-supabase-storage-admin
+    enableImageTransformation: true
+    jwtAuth:
+      # will be created by Core resource operator if not present
+      # just make sure the secret name is either based on the name of the core resource or explicitly set
+      secretName: core-sample-jwt
+    workloadTemplate:
+      workload:
+        volumeMounts:
+          - name: storage-temp
+            mountPath: /tmp
+      additionalVolumes:
+        - name: storage-temp
+          emtpyDir:
+            sizeLimit: 500Mi
+  imageProxy:
+    enable: true