diff --git a/.gitea/workflows/build.yaml b/.gitea/workflows/build.yaml
index 9bdf816..ad7d5e4 100644
--- a/.gitea/workflows/build.yaml
+++ b/.gitea/workflows/build.yaml
@@ -8,6 +8,8 @@ env:
   # Hostname only (no scheme) — Gitea container registry on this demo stack.
   REGISTRY: gitea-dev.alertaware.com
   IMAGE: demo
+  # act_runner DinD listens on the job host network (see runner config.yaml).
+  DOCKER_HOST: tcp://127.0.0.1:2375
 
 jobs:
   docker: