feat(reverse_proxy): add Netcup DNS ACME challenge support and refactor Caddy setup

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

playbooks/common-k3s.yml

@@ -1,10 +0,0 @@
----
-- name: Run the common role on k3s
-  hosts: k3s
-  gather_facts: yes
-  vars_files:
-    - secrets.yml
-  roles:
-    - role: common
-      tags:
-        - common

playbooks/docker-lb.yml

@@ -1,6 +1,6 @@
 ---
 - name: Set up reverse proxy for docker
-  hosts: docker_lb
+  hosts: docker
   gather_facts: true
   vars_files:
     - secrets.yml
@@ -8,6 +8,8 @@
     - role: common
       tags:
         - common
+      when: inventory_hostname in groups["docker_lb"]
     - role: reverse_proxy
       tags:
         - reverse_proxy
+      when: inventory_hostname in groups["docker_lb"]

playbooks/test.yml

@@ -1,9 +0,0 @@
----
-- hosts: db
-  gather_facts: yes
-  vars_files:
-    - secrets.yml
-  tasks:
-    - name: Print the database connection string
-      debug:
-        msg: "{{ k3s_db_connection_string }}"