diff --git a/.gitea/workflows/build-gx12.yml b/.gitea/workflows/build-gx12.yml
new file mode 100644
index 000000000..290894795
--- /dev/null
+++ b/.gitea/workflows/build-gx12.yml
@@ -0,0 +1,35 @@
+name: Build EdgeTX GX12
+
+on:
+  workflow_dispatch:
+
+jobs:
+  build:
+    runs-on: edgetx-build
+    timeout-minutes: 90
+    env:
+      FLAVOR: gx12
+      CMAKE_BUILD_PARALLEL_LEVEL: 4
+
+    steps:
+      - name: Checkout EdgeTX source
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Build unmodified GX12 firmware
+        shell: bash
+        run: |
+          set -euo pipefail
+          ./tools/build-gh.sh
+          test -f "gx12-$(git rev-parse --short HEAD).bin"
+          sha256sum gx12-*.bin
+
+      - name: Upload GX12 firmware
+        uses: actions/upload-artifact@v4
+        with:
+          name: edgetx-gx12-${{ github.sha }}
+          retention-days: 30
+          path: |
+            gx12-*.bin
+            LICENSE