Update starship config with ContainerLab module

Add custom module to display ContainerLab topology name when present in
the directory

.config/starship.toml

@@ -85,3 +85,13 @@ style = 'bold fg:#E297DB'
 pyenv_version_name = false
 detect_extensions = ['py']
 detect_files = ['.python-version', 'pyproject.toml', 'requirements.txt', 'setup.py', 'Pipfile']
+
+# Shows if a ContainerLab topology file is present in the current directory
+[custom.containerlab]
+description = "Shows ContainerLab topology name when present"
+command = 'grep -m1 "^name:" *.clab.y*ml 2>/dev/null | head -1 | cut -d: -f2 | xargs'
+when = 'ls *.clab.yml *.clab.yaml 2>/dev/null | grep -q .'
+symbol = '󰒍 '
+format = 'via [$symbol($output)]($style) '
+style = 'bold fg:#C58FFF'
+shell = ['bash', '--noprofile', '--norc']