diff --git a/.gitea/workflows/build-ext.yml b/.gitea/workflows/build-ext.yml
new file mode 100644
index 0000000..a319eb1
--- /dev/null
+++ b/.gitea/workflows/build-ext.yml
@@ -0,0 +1,25 @@
+name: lecoffre_node-ci-ext
+
+on:
+  push:
+    tags:
+      - ext
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Print context
+        run: |
+          set -euo pipefail
+          echo "Repository: $GITHUB_REPOSITORY"
+          echo "Ref: $GITHUB_REF"
+          echo "Sha: $GITHUB_SHA"
+      - name: Validate repo structure
+        run: |
+          set -euo pipefail
+          test -f docker-compose.yml && echo "docker-compose.yml found"
+          test -d conf && echo "conf/ found"
+          test -d scripts && echo "scripts/ found"