CI/CD: Gitea workflow + docker-compose for Swarm

docker-compose.yml

@@ -1,8 +1,19 @@
 services:
   zlb:
+    image: git.hacecalor.net/ichitux/zlb:latest
     build:
       context: .
       dockerfile: Dockerfile
     ports:
       - "35207:80"
     restart: unless-stopped
+    deploy:
+      replicas: 1
+      update_config:
+        order: start-first
+        failure_action: rollback
+      restart_policy:
+        condition: any
+      placement:
+        constraints:
+          - node.role == manager