kata-deploy: Complete containerd config for erofs snapshotter

Add missing containerd configuration items for erofs snapshotter to
enable fsmerged erofs feature:

- Add differ plugin configuration:
  - mkfs_options: ["-T0","--mkfs-time","--sort=none"]
  - enable_tar_index: false

- Add snapshotter plugin configuration:
  - default_size: "10G"
  - max_unmerged_layers: 1

These configurations align with the documentation in
docs/how-to/how-to-use-fsmerged-erofs-with-kata.md Step 2,
ensuring the CI workflow run-k8s-tests-coco-nontee-with-erofs-snapshotter
can properly configure containerd for erofs fsmerged rootfs.

Signed-off-by: Alex Lyn <alex.lyn@antgroup.com>

tools/packaging/kata-deploy/binary/src/artifacts/snapshotters.rs

@@ -30,6 +30,20 @@ pub async fn configure_erofs_snapshotter(
         "[\"erofs\",\"walking\"]",
     )?;
 
+    //// Configure erofs differ plugin
+    //// erofs-utils >= 1.8.2
+    //toml_utils::set_toml_value(
+    //    configuration_file,
+    //    ".plugins.\"io.containerd.differ.v1.erofs\".mkfs_options",
+    //    "[\"-T0\",\"--mkfs-time\",\"--sort=none\"]",
+    //)?;
+    toml_utils::set_toml_value(
+        configuration_file,
+        ".plugins.\"io.containerd.differ.v1.erofs\".enable_tar_index",
+        "false",
+    )?;
+
+    // Configure erofs snapshotter plugin
     toml_utils::set_toml_value(
         configuration_file,
         ".plugins.\"io.containerd.snapshotter.v1.erofs\".enable_fsverity",
@@ -40,6 +54,16 @@ pub async fn configure_erofs_snapshotter(
         ".plugins.\"io.containerd.snapshotter.v1.erofs\".set_immutable",
         "true",
     )?;
+    toml_utils::set_toml_value(
+        configuration_file,
+        ".plugins.\"io.containerd.snapshotter.v1.erofs\".default_size",
+        "\"10G\"",
+    )?;
+    toml_utils::set_toml_value(
+        configuration_file,
+        ".plugins.\"io.containerd.snapshotter.v1.erofs\".max_unmerged_layers",
+        "1",
+    )?;
 
     Ok(())
 }