install: do not clone git repo for local development

use ansible with flag `-e local_development=false` to
skip cloning of git repo (useful with docker bind mounts
to existing repos)

ansible/playbooks/setup.yml

@@ -25,6 +25,7 @@
         repo: https://git.decapod.one/brethil/dotfiles
         dest: "{{ DOTFILES }}"
         version: master
+      when: local_development is not defined
 
     - name: antibody
       shell: |