chore: add healthcheck configuration for backend and update service dependencies to ensure healthy startup

docker/docker-compose.dev.yml

@@ -92,6 +92,12 @@ services:
         condition: service_healthy
       redis:
         condition: service_healthy
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 15s
+      timeout: 5s
+      retries: 30
+      start_period: 200s
 
   celery_worker:
     build: ../surfsense_backend
@@ -116,7 +122,7 @@ services:
       redis:
         condition: service_healthy
       backend:
-        condition: service_started
+        condition: service_healthy
 
   celery_beat:
     build: ../surfsense_backend
@@ -184,8 +190,10 @@ services:
     env_file:
       - ../surfsense_web/.env
     depends_on:
-      - backend
-      - electric
+      backend:
+        condition: service_healthy
+      electric:
+        condition: service_healthy
 
 volumes:
   postgres_data: