Add $PSScriptRoot to make path absolute #130

Job	Run time
ubuntu-latest-Debug-CMake build and tests	3m 20s
ubuntu-latest-Debug-CMake build and tests	3m 20s
windows-latest-Debug-CMake build and tests	3m 49s
windows-latest-Debug-CMake build and tests	3m 49s
ubuntu-latest-Release-CMake build and tests	4m 26s
ubuntu-latest-Release-CMake build and tests	4m 26s
windows-latest-Release-CMake build and tests	5m 38s
windows-latest-Release-CMake build and tests	5m 38s
build-and-test-with-udk / build-and-test-with-udk (windows-latest, Debug)	5m 17s
build-and-test-with-udk / build-and-test-with-udk (windows-latest, Debug)	4m 34s
build-and-test-with-udk / build-and-test-with-udk (windows-latest, Release)	5m 16s
build-and-test-with-udk / build-and-test-with-udk (windows-latest, Release)	4m 55s
${{ matrix.os }}-${{ matrix.build_type }}-${{ github.workflow }}	0s
${{ matrix.os }}-${{ matrix.build_type }}-${{ github.workflow }}	0s
	54m 28s

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