preserve sudo env #23

Job	Run time
Homebrew packaging unit tests	8m 37s
Node.js unit tests on macos-latest	59s
Apache 2 integration tests on macos-latest	3m 58s
C++ unit tests on macos-latest, as root	20m 58s
Node.js unit tests on ubuntu-latest	51s
C++ unit tests on ubuntu-latest, as root	6m 46s
Source packaging unit tests	56s
Ruby unit tests on macos-latest	2m 17s
Nginx dynamic module integration tests on macos-latest	3m 23s
C++ unit tests on macos-latest, as normal-user	4m 17s
Ruby unit tests on ubuntu-latest	3m 30s
Nginx integration tests on macos-latest	3m 37s
C++ unit tests on ubuntu-latest, as normal-user	6m 33s
Standalone integration tests on macos-latest	4m 58s
Apache 2 integration tests on ubuntu-latest	4m 53s
Nginx dynamic module integration tests on ubuntu-latest	4m 36s
Nginx integration tests on ubuntu-latest	4m 17s
Standalone integration tests on ubuntu-latest	5m 31s
	1h 30m 57s

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