feat: add ssh connection retry

.env.sample

@@ -1,11 +1,11 @@
 HOST=localhost
 PORT=3000
 BASE_URL=http://localhost:5173
-BACKEND_URL=http://localhost:3000
 MONGO_URL=mongodb://localhost:27017/odyssey-test
 SECRET_KEY=sample-secret
 
 # Optional
+# BACKEND_URL=http://host.docker.internal:3000
 # CONTAINER_EXPIRY=60     # 60 minutes
 # SESSION_MAX_AGE=168      # 7 days
 # TRUSTED_PROXIES=1.2.3.4