feat(homarr): use handler for restart, validate encryption key

roles/homarr/handlers/main.yml

@@ -1,3 +1,8 @@
 #SPDX-License-Identifier: MIT-0
 ---
 # handlers file for homarr
+
+- name: restart homarr
+  community.docker.docker_compose_v2:
+    project_src: "{{ homarr_docker_compose_dir }}"
+    state: restarted