Initial support for Nokia Mag-C CMG Linux. (#216)

* Initial support for Nokia Mag-C CMG Linux.
CMG Linux is used as a DB VM which is a part of Nokia Mag-C VMs.

* Fix several error or warnings from DeepSource

* formatting and no install recommends

* added yaml dep

---------

Co-authored-by: Roman Dodin <dodin.roman@gmail.com>

cmglinux/Makefile

@@ -0,0 +1,12 @@
+VENDOR=Canonical
+NAME=Ubuntu
+IMAGE_FORMAT=qcow2
+IMAGE_GLOB=*.qcow2
+
+# match versions like:
+# cmg-linux-24.3.R1.qcow2
+VERSION=$(shell echo $(IMAGE) | sed -e 's/.\+[^0-9]\([0-9]\+\.[0-9]\+\.[A-Z][0-9]\+\(-[0-9]\+\)\?\)[^0-9].*$$/\1/')
+
+
+-include ../makefile-sanity.include
+-include ../makefile.include

cmglinux/README.md

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+# CMG Linux VM
+
+## Introduction
+
+CMG Linux is utilized as a DB VM as one of Nokia MAG-C VMs.
+The image of CMG Linux is released in qcow2 format.
+Since some of MAG-C tools in CMG Linux are written with systemd or systemctl utilization,
+then CMG Linux cannot be containerized because docker does not run systemd inside the container.
+Given this reasoning, the approach to containerized CMG Linux is to create a container
+to run a CMG Linux VM in the same way Vrnetlab has done.
+
+## Build the docker image
+
+It is required to provide CMG Linux qcow2 image to build the docker image.
+Nokia representative can provide the qcow2 file.
+
+Make sure that your python virtualenv has `yaml` package installed.
+
+Copy the `cmg-linux.qcow2` file in `vrnetlab/cmglinux` directory
+and rename the file by appending the version to it.
+For example, for CMG Linux version 24.3.r1,
+make sure that the qcow2 file will be named as `cmg-linux-24.3.R1.qcow2`.
+The version 24.3.R1 will be used as a container image tag.
+
+Run `make docker-image` to start the build process.
+The resulting image is called `vrnetlab/cmglinux:<version>`.
+You can tag it with something else. for example, `cmglinux:<version>`.
+
+## Host requirements
+
+* 4 vCPU
+* 6 GB RAM
+
+## Configuration
+
+Initial config is carried out via cloud-init.
+By default CMG-Linux boots by using a pre-defined cloud-init config drive.
+
+Custom configuration can be added by binding the local `config_drive`
+directory to `/config_drive` directory in the container.
+The accepted structure of `config_drive`is shown below.
+Any other directories or files not specified below are ignored.
+
+``` text
+config_drive/
+└── openstack/
+    ├── latest/
+    │   ├── meta_data.json
+    │   └── user_data
+    └── content/
+        ├── 0000 (referenced content files)
+        ├── 0001
+        └── ....
+```
+
+The internal `launch.py` script also modifies the content of `user_data` to add `clab`as
+default user with password `clab@123`. Moreover, it also modifies `user_data`
+to configure the management network interface.
+
+Also `9.9.9.9` configured as the DNS resolver. Change it with `resolvectl` if required.
+
+## Example containerlab topology
+
+Below is an example of Containerlab topology using CMG Linux.
+
+``` yaml
+name: test_cmglinux
+prefix: __lab-name
+topology:
+  nodes:
+    cmg-1:
+      kind: generic_vm
+      image: vrnetlab/vr-cmglinux:24.3.R3
+      binds:
+        - config_drive_cmg1:/config_drive
+    cmg-2:
+      kind: generic_vm
+      image: vrnetlab/vr-cmglinux:24.3.R1
+      binds:
+        - config_drive_cmg2:/config_drive
+    alpine:
+      kind: linux
+      image: alpine:dev
+  links:
+  - endpoints:
+      - cmg-1:eth1
+      - alpine:eth1
+  - endpoints:
+      - cmg-1:eth2
+      - alpine:eth2
+  - endpoints:
+      - cmg-1:eth3
+      - alpine:eth3
+  - endpoints:
+      - cmg-2:eth1
+      - alpine:eth4
+  - endpoints:
+      - cmg-2:eth2
+      - alpine:eth5
+```

cmglinux/docker/Dockerfile

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+FROM public.ecr.aws/docker/library/debian:bookworm-slim
+
+ARG DEBIAN_FRONTEND=noninteractive
+ARG DISK_SIZE=4G
+
+RUN apt-get update -qy \
+   && apt-get install -y --no-install-recommends \
+   bridge-utils \
+   iproute2 \
+   socat \
+   qemu-kvm \
+   tcpdump \
+   ssh \
+   inetutils-ping \
+   dnsutils \
+   iptables \
+   nftables \
+   telnet \
+   genisoimage \
+   python3-yaml \
+   sshpass \
+   && rm -rf /var/lib/apt/lists/*
+
+ARG IMAGE
+COPY $IMAGE* /
+COPY *.py /
+
+# RUN qemu-img resize /${IMAGE} ${DISK_SIZE}
+
+EXPOSE 22 5000 10000-10099
+HEALTHCHECK CMD ["/healthcheck.py"]
+ENTRYPOINT ["/launch.py"]