fix(semaphore): make network creation task more reliable

ansible/roles/semaphore/tasks/main.yml

@@ -58,10 +58,11 @@
 
     - name: Ensure dedicated Podman network exists
       ansible.builtin.command:
-        cmd: "podman network exists semaphore-net || podman network create semaphore-net"
+        cmd: "podman network create semaphore-net"
       become: true
+      register: net_create
       failed_when: false
-      changed_when: false
+      changed_when: net_create.rc == 0
 
     - name: Ensure required Podman volumes exist (reuse if present)
       ansible.builtin.command: