Rename "container" to "image"

- Updated `wwctl upgrade` to handle updates
- Maintained `.Container` and `.ContainerName` in tstruct
- Added `ContainerName()` methods to node and profile objects
- Added `--container`, `-C` aliases to wwctl commands (`<node|profile> <add|set>`)
- Added `wwctl container` alias
- Added support for `container_exit.sh` if `image_exit.sh` is not found

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

userdocs/quickstart/debian12.rst

@@ -126,16 +126,16 @@ instructions.
    to run ``$ sudo restorecon -Rv /var/lib/tftpboot/`` if there are
    errors with TFTP still.
 
-Pull and build the VNFS container (including the kernel)
-========================================================
+Pull and build the image (including the kernel)
+===============================================
 
-This will pull a basic VNFS container from Docker Hub and import the
+This will pull a basic image from Docker Hub and import the
 default running kernel from the controller node and set both in the
 "default" node profile.
 
 .. code-block:: bash
 
-   wwctl container import docker://ghcr.io/warewulf/warewulf-debian:12.0 debian-12.0
+   wwctl image import docker://ghcr.io/warewulf/warewulf-debian:12.0 debian-12.0
 
 
 Set up the default node profile
@@ -145,12 +145,12 @@ Node configurations can be set via node profiles. Each node by default
 is configured to be part of the ``default`` node profile, so any
 changes you make to that profile will affect all nodes.
 
-The following command will set the container we just imported above to
+The following command will set the image we just imported above to
 the ``default`` node profile:
 
 .. code-block:: bash
 
-   sudo wwctl profile set --yes --container debian-12.0 "default"
+   sudo wwctl profile set --yes --image debian-12.0 "default"
 
 
 Next we set some default networking configurations for the first

userdocs/quickstart/el.rst

@@ -93,7 +93,7 @@ address of your cluster's private network interface.
      - path: /opt
        export options: ro,sync,no_root_squash
      systemd name: nfs-server
-   container mounts:
+   image mounts:
    - source: /etc/resolv.conf
      dest: /etc/resolv.conf
      readonly: true
@@ -143,17 +143,17 @@ configure --all``.
    you may need to run ``restorecon -Rv /var/lib/tftpboot/`` to label
    files written to q`tftpboot``.
 
-Add a base node image container
-===============================
+Add a base node image
+=====================
 
-This will pull a basic node image container from Docker Hub and import the
+This will pull a basic node image from Docker Hub and import the
 default running kernel from the controller node and set both in the
 "default" node profile.
 
 .. code-block:: bash
 
-   wwctl container import docker://ghcr.io/warewulf/warewulf-rockylinux:9 rockylinux-9 --build
-   wwctl profile set default --container rockylinux-9
+   wwctl image import docker://ghcr.io/warewulf/warewulf-rockylinux:9 rockylinux-9 --build
+   wwctl profile set default --image rockylinux-9
 
 Configure the default node profile
 ==================================

userdocs/quickstart/suse15.rst

@@ -72,7 +72,7 @@ address of your cluster's private network interface:
       - path: /opt
         export options: ro,sync,no_root_squash
       systemd name: nfs-server
-    container mounts:
+    image mounts:
       - source: /etc/resolv.conf
         dest: /etc/resolv.conf
         readonly: true
@@ -109,16 +109,16 @@ instructions.
 
    sudo wwctl configure --all
 
-Pull and build the VNFS container and kernel
-============================================
+Pull and build the image and kernel
+===================================
 
-This will pull a basic VNFS container from Docker Hub and import the
+This will pull a basic image from Docker Hub and import the
 default running kernel from the controller node and set both in the
 "default" node profile.
 
 .. code-block:: bash
 
-   $ sudo wwctl container import docker://registry.opensuse.org/science/warewulf/leap-15.4/containers/kernel:latest leap15.4 --setdefault
+   $ sudo wwctl image import docker://registry.opensuse.org/science/warewulf/leap-15.4/images/kernel:latest leap15.4 --setdefault
 
 Set up the default node profile
 ===============================