Building a devcontainer setup

Relevant for #325

.devcontainer/Dockerfile

+# The devcontainer will be based on Python
+# The base container already has entrypoint, vscode user account, etc. out of the box
+FROM mcr.microsoft.com/devcontainers/python:3-bookworm
+
+# containelab version will be set in devcontainer.json
+ARG _CLAB_VERSION
+
+# install some basic tools inside the container
+# adjust this list based on your demands
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+    sshpass \
+    curl \
+    iputils-ping \
+    htop \
+    && rm -rf /var/lib/apt/lists/* \
+    && rm -Rf /usr/share/doc && rm -Rf /usr/share/man \
+    && apt-get clean
+
+# install preferred version of the containerlab
+RUN bash -c "$(curl -sL https://get.containerlab.dev)" -- -v ${_CLAB_VERSION} \
+    && pip3 install --user yamllint