Merge pull request #865 from LiskHQ/864-cache-node-modules

Cache node_modules - Closes #864

Jenkinsfile

@@ -44,7 +44,15 @@ node('lisk-nano') {
 
     stage ('Install npm dependencies') {
       try {
-        sh 'npm install'
+        sh '''
+        cp -r ~/cache/development/node_modules ./ || true
+        npm install
+        ./node_modules/protractor/bin/webdriver-manager update
+        # cache nightly builds (development) only to save space
+        if [ $BRANCH_NAME = "development" ]; then
+            rsync -axl --delete $WORKSPACE/node_modules/ ~/cache/development/node_modules/ || true
+        fi
+        '''
       } catch (err) {
         echo "Error: ${err}"
         fail('Stopping build: npm install failed')
@@ -110,7 +118,6 @@ node('lisk-nano') {
           # End to End test configuration
           export DISPLAY=:1$N
           Xvfb :1$N -ac -screen 0 1280x1024x24 &
-          ./node_modules/protractor/bin/webdriver-manager update
 
           # Run end-to-end tests
           npm run --silent e2e-test -- --params.baseURL http://localhost:808$N/ --params.liskCoreURL http://localhost:400$N