meta-digi: document dey-image-container-manager usage

Document dey-image-container-manager in meta-digi-containers and
update the ccmp25-dvk and ccimx95-dvk build template notes so the
image is listed during environment setup together with its
virtualization requirement.

https://onedigi.atlassian.net/browse/DEL-9996

Signed-off-by: Isaac Hermida <isaac.hermida@digi.com>

meta-digi-arm/conf/templates/ccimx95-dvk/conf-notes.txt

@@ -18,3 +18,9 @@ Digi Embedded Yocto provides the following image recipes:
 
     Expansion of custom Digi core-image-base including full Flutter
     framework support.
+
+  * dey-image-container-manager: container management image
+
+    Minimal image including the trimmed Podman and LXC runtimes used to
+    manage container artifacts on target.
+    Requires DISTRO_FEATURES:append = " virtualization" in local.conf.

meta-digi-arm/conf/templates/ccmp25-dvk/conf-notes.txt

@@ -19,6 +19,12 @@ Digi Embedded Yocto provides the following image recipes:
     Expansion of custom Digi core-image-base including full Flutter
     framework support.
 
+  * dey-image-container-manager: container management image
+
+    Minimal image including the trimmed Podman and LXC runtimes used to
+    manage container artifacts on target.
+    Requires DISTRO_FEATURES:append = " virtualization" in local.conf.
+
   * core-image-base: a console-only image
 
     Expansion of native core-image-base by including all the support for the

meta-digi-containers/README.md

@@ -2,7 +2,20 @@
 
 Yocto layer for Digi container-focused image generation and packaging.
 
-This layer provides the `dey-image-container` image recipe and related logic to produce:
+This layer provides:
+
+- `dey-image-container` to generate container artifacts
+- `dey-image-container-manager` to run and manage Podman/LXC containers on target
+
+`dey-image-container-manager` installs dedicated `lxc-trimmed` and `podman-trimmed`
+recipes, so it does not require `DISTROOVERRIDES` changes in `local.conf`
+and does not affect other DEY images built in the same environment.
+
+The layer explicitly depends on `meta-virtualization`, and
+`dey-image-container-manager`
+requires `DISTRO_FEATURES:append = " virtualization"` in `local.conf`.
+
+The `dey-image-container` workflow produces:
 
 - A base rootfs (`tar.xz`)
 - An OCI image output
@@ -20,9 +33,10 @@ that OCI artifact into a `docker-archive` tar using `skopeo`.
 
 ## Layer Scope
 
-Main recipe:
+Main recipes:
 
 - `recipes-core/images/dey-image-container.bb`
+- `recipes-core/images/dey-image-container-manager.bb`
 
 Recipe includes:
 
@@ -37,6 +51,11 @@ Container support files:
 - `containers/<profile>/rootfs_files/` (profile rootfs overlays)
 - `containers/<profile>/artifact/` (optional artifact metadata template)
 
+Container runtime recipes:
+
+- `recipes-containers/lxc/lxc-trimmed_git.bb`
+- `recipes-containers/podman/podman-trimmed_git.bb`
+
 ## Add The Layer
 
 In your build environment: