fix build script

.gitlab-ci.yml

@@ -16,6 +16,11 @@ job2:
 
 job3:
         stage: build
+        only:
+                refs:
+                        -master
+        variables:
+                GIT_SUBMODULE_STRATEGY: recursive
         before_script:
                 - apt update
                 - apt install -y msp430-libc