Add default for include_vars #321

Job	Run time
lint	21s
test (default, debian11, stable, 1.67.0)	1m 37s
test (default, debian11, stable)	1m 44s
test-archlinux (archlinux, archlinux, stable, 1.67.0)	1m 57s
test (default, debian11, beta, 1.67.0)	1m 40s
test-archlinux (archlinux, archlinux, stable)	1m 49s
test-archlinux (archlinux, archlinux, beta, 1.67.0)	1m 51s
test (default, debian11, beta)	1m 40s
test-archlinux (archlinux, archlinux, beta)	1m 49s
test (default, debian12, stable, 1.67.0)	1m 37s
test (default, debian12, stable)	1m 45s
test (default, debian12, beta, 1.67.0)	1m 38s
test (default, debian12, beta)	1m 36s
test (default, fedora39, stable, 1.67.0)	2m 13s
test (default, fedora39, stable)	2m 2s
test (default, fedora39, beta, 1.67.0)	2m 11s
test (default, fedora39, beta)	2m 32s
test (default, fedora40, stable, 1.67.0)	1m 54s
test (default, fedora40, stable)	1m 45s
test (default, fedora40, beta, 1.67.0)	1m 48s
test (default, fedora40, beta)	1m 48s
test (default, ubuntu2204, stable, 1.67.0)	1m 41s
test (default, ubuntu2204, stable)	1m 42s
test (default, ubuntu2204, beta, 1.67.0)	1m 42s
test (default, ubuntu2204, beta)	1m 47s
test (default, ubuntu2404, stable, 1.67.0)	1m 59s
test (default, ubuntu2404, stable)	1m 42s
test (default, ubuntu2404, beta, 1.67.0)	1m 42s
test (default, ubuntu2404, beta)	1m 38s
release	15s
	51m 25s

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