Fix bash loop syntax in API readiness check

Change from brace expansion to while loop for better portability.

ansible/roles/authentik/tasks/flows.yml

@@ -7,13 +7,15 @@
 
 - name: Wait for Authentik API to be ready
   shell: |
-    for i in {1..30}; do
+    i=1
+    while [ $i -le 30 ]; do
       if docker exec authentik-server curl -sf -H "Authorization: Bearer {{ authentik_api_token }}" http://localhost:9000/api/v3/core/tenants/ > /dev/null 2>&1; then
         echo "Authentik API is ready"
         exit 0
       fi
       echo "Waiting for Authentik API... attempt $i/30"
       sleep 5
+      i=$((i+1))
     done
     exit 1
   register: api_wait