container, service: Support reloading containers on template file change

roles/container/vars/main/general.yaml

@@ -69,6 +69,10 @@ _container_labels: >-
     else {}
   }}
 
+_container_reload_commands:
+  kill: podman kill --signal HUP {{ container_name }}
+  command: podman exec {{ container_name }} {{ container_reload_command }}
+
 _container_quadlet_unit_options: |
   [Unit]
   Description=Container {{ container_name }}
@@ -90,8 +94,12 @@ _container_quadlet_auto_start_options: |
 
   [Install]
   WantedBy=multi-user.target
+_container_quadlet_reload_options: |
+  [Service]
+  ExecReload={{ _container_reload_commands[container_reload_method] }}
 _container_quadlet_options_incl_empty:
   - "{{ 'AutoUpdate=registry' if container_auto_update else '' }}"
   - "{{ _container_quadlet_unit_options }}"
   - "{{ _container_quadlet_auto_start_options if container_auto_start else '' }}"
+  - "{{ _container_quadlet_reload_options if container_reload_method != 'none' else '' }}"
 _container_quadlet_options: "{{ _container_quadlet_options_incl_empty | select('!=', '') }}"