Deploy a simple webserver docker-compose stack

The beginning of a revamp of FRITA infrastructure into containers

dev/vars/webserver.yml

@@ -0,0 +1,5 @@
+docker_users:
+  - vagrant
+
+webserver_env:
+  TRAEFIK_DOMAIN: traefik.example.org

dev/webserver.yml

@@ -0,0 +1,8 @@
+- name: Install FRITA Web Server
+  hosts: all
+  become: true
+  vars_files:
+    - vars/webserver.yml
+  roles:
+    - docker
+    - webserver