Install the following packages:

pkg install -y bash git gmake cmake cmocka openssl wget pkgconf ccache bash

Create gitlab-runner user:

pw group add -n gitlab-runner
pw user add -n gitlab-runner -g gitlab-runner -s /usr/local/bin/bash
mkdir /home/gitlab-runner
chown gitlab-runner:gitlab-runner /home/gitlab-runner

Get the gitlab-runner binary for freebsd:

wget -O /usr/local/bin/gitlab-runner https://gitlab-runner-downloads.s3.amazonaws.com/latest/binaries/gitlab-runner-freebsd-amd64

chmod +x /usr/local/bin/gitlab-runner

Create a log file and allow access:

touch /var/log/gitlab_runner.log && chown gitlab-runner:gitlab-runner /var/log/gitlab_runner.log

We need a start script to run it on boot:

mkdir -p /usr/local/etc/rc.d
cat > /usr/local/etc/rc.d/gitlab_runner << EOF
#!/usr/local/bin/bash
# PROVIDE: gitlab_runner
# REQUIRE: DAEMON NETWORKING
# BEFORE:
# KEYWORD:
 
. /etc/rc.subr
 
name="gitlab_runner"
rcvar="gitlab_runner_enable"
 
load_rc_config $name
 
user="gitlab-runner"
user_home="/home/gitlab-runner"
command="/usr/local/bin/gitlab-runner run"
pidfile="/var/run/${name}.pid"
 
start_cmd="gitlab_runner_start"
stop_cmd="gitlab_runner_stop"
status_cmd="gitlab_runner_status"
 
gitlab_runner_start()
{
    export USER=${user}
    export HOME=${user_home}
 
    if checkyesno ${rcvar}; then
        cd ${user_home}
        /usr/sbin/daemon -u ${user} -p ${pidfile} ${command} > /var/log/gitlab_runner.log 2>&1
    fi
}
 
gitlab_runner_stop()
{
    if [ -f ${pidfile} ]; then
        kill `cat ${pidfile}`
    fi
}
 
gitlab_runner_status()
{
    if [ ! -f ${pidfile} ] || kill -0 `cat ${pidfile}`; then
        echo "Service ${name} is not running."
    else
        echo "${name} appears to be running."
    fi
}
 
run_rc_command $1
EOF
chmod +x /usr/local/etc/rc.d/gitlab_runner