Add tests for making sure that template files have no syntax errors

src/Misc/layoutbin/update.sh.template

@@ -123,7 +123,8 @@ fi
 # fix upgrade issue with macOS when running as a service
 attemptedtargetedfix=0
 currentplatform=$(uname | awk '{print tolower($0)}')
-if [[ "$currentplatform" == 'darwin'  && $restartinteractiverunner -eq 0 ]]; then
+if [[ "$currentplatform" == 'darwin'  && $restartinteractiverunner -eq 0 ]];
+then
     # We needed a fix for https://github.com/actions/runner/issues/743
     # We will recreate the ./externals/nodeXY/bin/node of the past runner version that launched the runnerlistener service
     # Otherwise mac gatekeeper kills the processes we spawn on creation as we are running a process with no backing file
@@ -217,4 +218,4 @@ if [ $restartinteractiverunner -ne 0 ]
 then
     date "+[%F %T-%4N] Restarting interactive runner"  >> "$logfile.succeed" 2>&1
     "$rootfolder/run.sh" &
-fi
+fi