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/config.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+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${LIGHTRED}$@${RESET}\n" 2>&1
+}
+
+success "I'm configured normally"
+touch .runner
+echo "$*" > runner_config
+success "created a dummy config file"
+success
+# Adding a counter to see how many times we've gone through the configuration step
+count=`cat counter 2>/dev/null|| echo "0"`
+count=$((count + 1))
+echo ${count} > counter
+