diff --git a/docker-compose.ci.yml b/docker-compose.ci.yml
new file mode 100644
index 00000000..2a944495
--- /dev/null
+++ b/docker-compose.ci.yml
@@ -0,0 +1,18 @@
+# CI override — replaces host bind mounts with ephemeral named volumes.
+# Host port bindings are handled via PORT_DB/PORT_MINIO_API env vars in ci.yml
+# (set to non-standard ports to avoid conflicts with system services on the runner).
+#
+# Usage:
+#   docker compose -f docker-compose.yml -f docker-compose.ci.yml up -d db minio create-buckets
+services:
+  db:
+    volumes:
+      - ci_postgres_data:/var/lib/postgresql/data
+
+  minio:
+    volumes:
+      - ci_minio_data:/data
+
+volumes:
+  ci_postgres_data:
+  ci_minio_data: