diff --git a/.gitea/workflows/build-ext.yml b/.gitea/workflows/build-ext.yml
new file mode 100644
index 0000000..9db0f78
--- /dev/null
+++ b/.gitea/workflows/build-ext.yml
@@ -0,0 +1,47 @@
+name: build-ext
+
+on:
+  push:
+    branches:
+      - ext
+    tags:
+      - ext
+
+jobs:
+  docker-build-push:
+    runs-on: docker
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to Registry
+        uses: docker/login-action@v3
+        with:
+          registry: git.4nkweb.com
+          username: ${{ secrets.USER }}
+          password: ${{ secrets.TOKEN }}
+
+      - name: Derive Docker tag
+        id: vars
+        run: |
+          DOCKER_TAG="ext"
+          echo "tag=${DOCKER_TAG}" >> $GITHUB_OUTPUT
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: linux/amd64
+          push: true
+          tags: |
+            git.4nkweb.com/4nk/4nk_certificator:${{ steps.vars.outputs.tag }}
+          cache-from: type=registry,ref=git.4nkweb.com/4nk/4nk_certificator:cache
+          cache-to: type=registry,ref=git.4nkweb.com/4nk/4nk_certificator:cache,mode=max
+
+