Fetch submodules

.drone.yml

@@ -3,6 +3,10 @@ name: default
 
 type: docker
 steps:
+  - name: submodules
+    image: build-release-linux
+    commands:
+      - git submodule update --init --recursive
   - name: build-release-linux
     image: deukhoofd/linux64builder
     environment: