runtime-rs: agent: add shared field to Storage struct

The proto Storage message already has a "shared" field (field 8),
but the runtime-rs agent crate's internal Storage struct was
missing it, so it was never forwarded to the kata-agent.

Add the field to the Rust struct and its From<Storage> translation,
and update all explicit struct initialisers across the resource
crate to include shared: false so the build stays clean.

This is needed for trusted ephemeral data storage, where the
agent uses the shared flag to avoid premature cleanup of volumes
that are shared across containers in a pod.

Signed-off-by: Fabiano Fidêncio <ffidencio@nvidia.com>
Assisted-by: Cursor <cursoragent@cursor.com>

src/runtime-rs/crates/agent/src/kata/trans.rs

@@ -114,6 +114,7 @@ impl From<Storage> for agent::Storage {
             fs_group: from_option(from.fs_group),
             options: trans_vec(from.options),
             mount_point: from.mount_point,
+            shared: from.shared,
             ..Default::default()
         }
     }

src/runtime-rs/crates/agent/src/types.rs

@@ -60,6 +60,7 @@ pub struct Storage {
     pub fs_group: Option<FSGroup>,
     pub options: Vec<String>,
     pub mount_point: String,
+    pub shared: bool,
 }
 
 #[derive(PartialEq, Clone, Default)]

src/runtime-rs/crates/resource/src/share_fs/share_virtio_fs_inline.rs

@@ -89,6 +89,7 @@ impl ShareFs for ShareVirtioFsInline {
             fs_group: None,
             options: SHARED_DIR_VIRTIO_FS_OPTIONS.clone(),
             mount_point: kata_guest_share_dir(),
+            shared: false,
         };
 
         storages.push(shared_volume);

src/runtime-rs/crates/resource/src/share_fs/share_virtio_fs_standalone.rs

@@ -246,6 +246,7 @@ impl ShareFs for ShareVirtioFsStandalone {
             fs_group: None,
             options: vec![String::from("nodev")],
             mount_point: kata_guest_share_dir(),
+            shared: false,
         };
 
         storages.push(shared_volume);

src/runtime-rs/crates/resource/src/share_fs/virtio_fs_share_mount.rs

@@ -108,6 +108,7 @@ impl ShareFsMount for VirtiofsShareMount {
                 fs_group: None,
                 options: config.mount_options.clone(),
                 mount_point: watchable_guest_mount.clone(),
+                shared: false,
             };
 
             // Update the guest_path, in order to identify what will

src/runtime-rs/crates/resource/src/volume/ephemeral_volume.rs

@@ -67,6 +67,7 @@ impl EphemeralVolume {
             fs_group: None,
             options: dir_options,
             mount_point: source.clone(),
+            shared: false,
         };
 
         let mut mount = oci::Mount::default();

src/runtime-rs/crates/resource/src/volume/local_volume.rs

@@ -75,6 +75,7 @@ impl LocalStorage {
             fs_group: None,
             options: dir_options,
             mount_point: source.clone(),
+            shared: false,
         };
 
         let mounts: Vec<oci::Mount> = if sid != cid {