ci: init submodules

Author: igor-sirotin

_assets/ci/Jenkinsfile.nix

@@ -24,6 +24,11 @@ pipeline {
   }
 
   stages {
+    stage('Init submodules') {
+      steps {
+        sh 'git submodule update --init --recursive'
+      }
+    }
     stage('Build library') {
       steps {
         script {