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>

group_vars/docker/vars.yml

@@ -1,7 +1,9 @@
 docker:
   url: "https://download.docker.com/linux"
   apt_release_channel: "stable"
-  dirs: "/opt/docker"
+  directories:
+    opt: "/opt/docker/"
+    compose: "/opt/docker/compose"
 
 caddy:
   admin_email: me+acme@tudattr.dev
@@ -443,6 +445,47 @@ services:
       - TZ=Europe/Berlin
       - QBT_EULA="accept"
       - QBT_WEBUI_PORT="8082"
+  - name: cadvisor
+    vm:
+      - docker-host00
+      - docker-host01
+      - docker-host02
+    container_name: cadvisor
+    image: gcr.io/cadvisor/cadvisor:latest
+    restart: unless-stopped
+    ports:
+      - name: ""
+        internal: 8080
+        external: 8081
+    volumes:
+      - name: "Root"
+        internal: /rootfs:ro
+        external: /
+      - name: "Run"
+        internal: /var/run:rw
+        external: /var/run
+      - name: "System"
+        internal: /sys:ro
+        external: /sys
+      - name: "Docker"
+        internal: /var/lib/docker:ro
+        external: /var/lib/docker
+  # - name: template
+  #   vm:
+  #     -
+  #   container_name:
+  #   image:
+  #   restart:
+  #   volumes:
+  #     - name:
+  #       internal:
+  #       external:
+  #   ports:
+  #     - name:
+  #       internal:
+  #       external:
+  #   environment:
+  #     -
   # - name: calibre
   #   vm:
   #     - docker-host00