diff --git a/.forgejo/workflows/impl.yaml b/.forgejo/workflows/impl.yaml
new file mode 100644
index 0000000..f671ad6
--- /dev/null
+++ b/.forgejo/workflows/impl.yaml
@@ -0,0 +1,10 @@
+on: [push]
+jobs:
+  build-hamnet70:
+    runs-on: docker
+    container:
+      image: git.tkolb.de/amateurfunk/hamnet70/impl_buildenv:0.1
+    steps:
+      - uses: actions/checkout@v4
+      - run: cd impl && cp src/config.h.template src/config.h && sed -i 's/undefined/"TESTCALL"/' src/config.h
+      - run: cd impl && make