feat(docker): Added cadvisor on all hosts, added docker metric exporter, added docker compose restart as handler, moved repetetive directory/permission creation into loops, moved repetetive values into variables, cleanup compose template for better empty lines

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

docker-lb.yml

@@ -0,0 +1,13 @@
+---
+- name: Set up reverse proxy for docker
+  hosts: docker_lb
+  gather_facts: yes
+  vars_files:
+    - secrets.yml
+  roles:
+    - role: common
+      tags:
+        - common
+    - role: reverse_proxy
+      tags:
+        - reverse_proxy