Add support for proxy networks & cleanup playbook vars

roles/bat/tasks/deb.yaml

@@ -51,6 +51,7 @@
   get_url:
     url: '{{asset.browser_download_url}}'
     dest: '{{bat_deb}}'
+  environment: '{{proxy_environment}}'
 
 - name: install .deb file
   when: installed_version is not defined or installed_version != latest_version