Docker wrapper: always mount slot dir at WORKDIR #5004

Job	Run time
libs-build	1m 53s
apps-build-release	1m 36s
client-build	2m 39s
apps-x86-build-release	1m 42s
apps-build	2m 19s
apps-arm64-build-release	6m 42s
libs-vcpkg-build	2m 21s
client-vcpkg-build	3m 9s
apps-vcpkg-build	4m 15s
libs-cmake-build	2m 20s
libs-arm64-build	1m 44s
apps-arm64-build	7m 38s
manager-with-webview-vcpkg-build	8m 33s
server-build	4m 15s
manager-with-webview-build	5m 43s
manager-without-webview-build	5m 44s
unit-test-build	3m 47s
integration-test-build	5m 13s
	1h 11m 33s

Provide feedback