Resolve "optimize pipeline"

Closes #29 (closed)

helpers/installNodejs.sh

@@ -10,6 +10,7 @@ curl -o /tmp/node-$NODE_VERSION-$NODE_DISTRO.tar.xz "$NODE_URL"
 
 tar -xJvf /tmp/node-$NODE_VERSION-$NODE_DISTRO.tar.xz -C /usr/local/lib
 mv /usr/local/lib/node-$NODE_VERSION-$NODE_DISTRO /usr/local/lib/nodejs
+rm /tmp/node-$NODE_VERSION-$NODE_DISTRO
 
 echo "export PATH=/usr/local/lib/nodejs/bin:$PATH" >> ~/.profile
 . ~/.profile
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