switch to debugging ruby #20

Job	Run time
Homebrew packaging unit tests	9m 30s
Node.js unit tests on macos-latest	53s
C++ unit tests on macos-latest, as root	20m 8s
Apache 2 integration tests on macos-latest	3m 8s
Node.js unit tests on ubuntu-latest	48s
C++ unit tests on ubuntu-latest, as root	6m 33s
Nginx dynamic module integration tests on macos-latest	2m 43s
Source packaging unit tests	58s
Ruby unit tests on macos-latest	2m 42s
C++ unit tests on macos-latest, as normal-user	3m 53s
Nginx integration tests on macos-latest	3m 6s
Ruby unit tests on ubuntu-latest	3m 35s
C++ unit tests on ubuntu-latest, as normal-user	6m 37s
Standalone integration tests on macos-latest	3m 41s
Apache 2 integration tests on ubuntu-latest	4m 49s
Nginx dynamic module integration tests on ubuntu-latest	4m 30s
Nginx integration tests on ubuntu-latest	4m 24s
Standalone integration tests on ubuntu-latest	5m 35s
	1h 27m 33s

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