feat: disable automatic runner updates (#1088)

* Add env variable to configure `disablupdate` flag

* Write test for entrypoint disable update

* Rename flag, update docs for DISABLE_RUNNER_UPDATE

* chore: bump runner version in makefile

Co-authored-by: Callum Tait <15716903+toast-gear@users.noreply.github.com>

test/entrypoint/should_work_disable_update/runsvc.sh

@@ -0,0 +1,31 @@
+#!/bin/bash
+
+set -euo pipefail
+
+export LIGHTGREEN='\e[0;32m'
+export LIGHTRED='\e[0;31m'
+export WHITE='\e[0;97m'
+export RESET='\e[0m'
+
+log(){
+  printf "\t${WHITE}$@${RESET}\n" 2>&1
+}
+
+success(){
+  printf "\t${LIGHTGREEN}$@${RESET}\n" 2>&1
+}
+
+error(){
+  printf "\t${LIGHTRED}$@${RESET}\n" 2>&1
+  exit 1
+}
+
+success ""
+success "Running the service..."
+# test if --once is present as a parameter
+echo "$*" | grep -q 'once' || error "Should include --once in the parameters"j
+success "...successful"
+touch runsvc_ran
+success ""
+
+