added git runner scripts

scripts/test/install-git-runner.sh

+#!/bin/bash
+apt-get update
+
+wget -O /usr/local/bin/gitlab-runner https://gitlab-runner-downloads.s3.amazonaws.com/latest/binaries/gitlab-runner-linux-amd64
+chmod +x /usr/local/bin/gitlab-runner
+useradd --comment 'GitLab Runner' --create-home gitlab-runner --shell /bin/bash
+
+gitlab-runner install --user=gitlab-runner --working-directory=/home/gitlab-runner
+gitlab-runner start
+
+gitlab-runner register -n --url https://gitlab.it-innovation.soton.ac.uk/ --r sN3wMQp8EiAv7znNwG5s --executor shell --locked true --name ${HOSTNAME} --description ${HOSTNAME} --run-untagged true
+
+apt-get -y install python3 python3-pip python-influxdb
+update-alternatives --install /usr/bin/python python /usr/bin/python3 10
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