Helper scripts (#298)

* Added helper scripts

* Added commit tag to version tag to builds from master

* Restored script for Travis

* Restored script for Jenkins

* Restored script for Jenkins

* Restored script for Jenkins

scripts/README.md

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+# Helpers
+
+## Running automatic updates
+
+```
+sudo ln -s /root/greenlight/scripts/deploy.sh /usr/local/bin/greenlight-deploy
+sudo cp /root/greenlight/scripts/greenlight-auto-deployer.service /etc/systemd/system/greenlight-auto-deployer.service
+sudo cp /root/greenlight/scripts/greenlight-auto-deployer.timer /etc/systemd/system/greenlight-auto-deployer.timer
+sudo systemctl daemon-reload
+sudo systemctl enable greenlight-auto-deployer.service
+sudo systemctl enable greenlight-auto-deployer.timer
+sudo systemctl start greenlight-auto-deployer.timer
+```

scripts/deploy.sh

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+#!/bin/bash
+
+STATUS="Status: Downloaded newer image for bigbluebutton/greenlight:v2"
+
+new_status=$(sudo docker pull bigbluebutton/greenlight:v2 | grep Status:)
+
+echo $new_status
+
+if [ "$STATUS" == "$new_status" ]
+then
+  cd /home/ubuntu/greenlight
+  sudo docker-compose down
+  sudo docker rmi $(sudo docker images -f dangling=true -q)
+  sudo docker-compose up -d
+fi
+
+exit 0

scripts/greenlight-auto-deployer.service

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+[Unit]
+Description=Greenlight Auto Deployer
+
+[Service]
+ExecStart=/bin/bash /usr/local/bin/greenlight-deploy

scripts/greenlight-auto-deployer.timer

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+[Unit]
+Description=Runs greenlight-deploy every minute
+
+[Timer]
+# Time to wait after booting before we run first time
+OnBootSec=1min
+# Time between running each consecutive time
+OnUnitActiveSec=1m
+Unit=greenlight-auto-deployer.service
+
+[Install]
+WantedBy=multi-user.target