Fail build if `make vendor` hasn't been run

_assets/ci/Jenkinsfile

@@ -47,9 +47,14 @@ pipeline {
 
     stage('Setup') { steps { dir(env.STATUS_PATH) {
       /* install release tools */
-      sh 'make release-install'
+      sh 'make release-install modvendor-install'
     } } } // stage(Setup)
 
+    stage('Vendoring check') { steps { dir(env.STATUS_PATH) {
+      /* fail build if vendoring hasn't been done */
+      sh 'GO111MODULE=on make vendor && git diff --exit-code --no-color --stat vendor/'
+    } } } // stage(Vendoring check)
+
     stage('Build') {
       parallel {
         stage('iOS') { steps { script {

_assets/ci/Jenkinsfile.android

@@ -58,9 +58,14 @@ pipeline {
     } } }
 
     stage('Setup') { steps { dir(env.STATUS_PATH) {
-      sh 'make setup-build'
+      sh 'make setup-build modvendor-install'
     } } }
 
+    stage('Vendoring check') { steps { dir(env.STATUS_PATH) {
+      /* fail build if vendoring hasn't been done */
+      sh 'GO111MODULE=on make vendor && git diff --exit-code --no-color --stat vendor/'
+    } } } // stage(Vendoring check)
+
     stage('Compile') { steps { dir(env.STATUS_PATH) {
       sh 'make statusgo-android'
       sh "cp build/bin/statusgo.aar ${dest}/${artifact}"

_assets/ci/Jenkinsfile.tests

@@ -39,9 +39,14 @@ pipeline {
     } } }
 
     stage('Setup') { steps { dir(env.STATUS_PATH) {
-      sh 'make setup-build'
+      sh 'GO111MODULE=off make setup-build modvendor-install'
     } } }
 
+    stage('Vendoring check') { steps { dir(env.STATUS_PATH) {
+      /* fail build if vendoring hasn't been done */
+      sh 'GO111MODULE=on make vendor && git diff --exit-code --no-color --stat vendor/'
+    } } } // stage(Vendoring check)
+
     stage('Lint') { steps { dir(env.STATUS_PATH) {
       sh 'make lint'
     } } }