ci: update deploy workflow for existing runner

deploy/docker-compose.runner.yml

@@ -0,0 +1,23 @@
+##############################################
+# Gitea Actions Runner — Portainer Stack
+#
+# In Portainer deployen:
+#   1. Stacks → Add Stack → "gitea-runner"
+#   2. Diese YAML einfügen
+#   3. Deploy
+##############################################
+
+services:
+  runner:
+    image: gitea/act_runner:latest
+    restart: unless-stopped
+    environment:
+      GITEA_INSTANCE_URL: https://git.purepixel.ch
+      GITEA_RUNNER_REGISTRATION_TOKEN: ${RUNNER_TOKEN}
+      GITEA_RUNNER_NAME: lageplan-runner
+    volumes:
+      - /var/run/docker.sock:/var/run/docker.sock
+      - runner_data:/data
+
+volumes:
+  runner_data: