allow debugging from luarocks build #69

Job	Run time
busted (luajit-openresty, ubuntu-latest)	30s
busted (luajit-openresty, windows-latest)	3m 0s
busted (luajit-openresty, macos-latest)	1m 9s
busted (luajit-2.1.0-beta3, ubuntu-latest)	35s
busted (luajit-2.1.0-beta3, windows-latest)	1m 42s
busted (luajit-2.1.0-beta3, macos-latest)	1m 20s
busted (luajit-git, ubuntu-latest)	31s
busted (luajit-git, windows-latest)	3m 4s
busted (luajit-git, macos-latest)	1m 17s
busted (5.4.6, ubuntu-latest)	1m 12s
busted (5.4.6, windows-latest)	1m 36s
busted (5.4.6, macos-latest)	1m 6s
busted (5.1.5, ubuntu-latest)	59s
busted (5.1.5, windows-latest)	1m 35s
busted (5.1.5, macos-latest)	44s
busted (5.3.6, ubuntu-latest)	41s
busted (5.3.6, windows-latest)	3m 31s
busted (5.3.6, macos-latest)	1m 5s
finish	6s
publish	0s
	25m 43s

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