installdependencies.sh prints incorrect return value in case of apt-get error

[Topi-ab]

Describe the bug
Lines

runner/src/Misc/layoutbin/installdependencies.sh

Lines 69 to 72 in ca2b1bc

	$apt_get update && $apt_get install -y libkrb5-3 zlib1g
	if [ $? -ne 0 ]
	then
	echo "'$apt_get' failed with exit code '$?'"

do not print out the actual error. The "$?" variable gets cleared with if -command.

FIX: Store the error code to a temporary variable before if, and then use that variable in both if and echo.

Also it would be good to print out the failing command line, like

apt_get update && $apt_get install -y libkrb5-3 zlib1g
failed with error code 7.

To Reproduce

Disconnect net when running the script.

Expected behavior
Should print the error code returnted by apt-get

Runner Version and Platform

Version of your runner? ??

OS of the machine running the runner? OSX/Windows/Linux/...
Linux

What's not working?

Error printing

Job Log Output

N/A

Runner and Worker's Diagnostic Logs

N/A