Add Volume: /var/lib/containers/storage

When running a bootc image as an OCI contianer, embeded containers
will fail. This is because OSTree on OSTree is not allowed. Defaulting
/var/lib/containers/storage to a Volume fixes the problem.

Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>

Author: rhatdan

centos-bootc-config.json

@@ -6,5 +6,8 @@
         "redhat.id": "centos",
         "redhat.version-id": "9"
     },
-    "StopSignal": "SIGRTMIN+3"
+    "StopSignal": "SIGRTMIN+3",
+    "Volumes": {
+        "/var/lib/containers/storage": {}
+    }
 }

fedora-bootc-config.json

@@ -5,5 +5,8 @@
         "redhat.id": "fedora",
         "redhat.version-id": "40"
     },
-    "StopSignal": "SIGRTMIN+3"
+    "StopSignal": "SIGRTMIN+3",
+    "Volumes": {
+        "/var/lib/containers/storage": {}
+    }
 }