* How to CICD to servers by git

** Create empty git repo on each server
mkdir -p ~/cicd/sisai-world-cicd.git
cd ~/cicd/sisai-world-cicd.git
git init --bare

** Copy svr_git_hooks_post-receive to ~/cicd/sisai-world-cicd.git/hooks/ on server
** Edit to fit server env and rename to post-receive
** chmod +x post-receive

** Edit and test code locally

** run deploy_XX.sh

**(Option)the first time may have to copy and edit .env file on servers

* Start node.js: 
pm2 start app.js --name sisai