tests

CI: install real ninja in Alpine Linux image #2349

Job	Run time
test (ubuntu, 3.7)	2m 2s
cygwin (3.9)	5m 27s
homebrew (3.8)	2m 23s
test (ubuntu, 3.12)	1m 45s
msvc (3.11)	2m 44s
test (macos, 3.7)	2m 13s
mypy	14s
homebrew (3.11)	1m 45s
test (macos, 3.12)	3m 38s
pyston (3.8)	1m 8s
test (windows, 3.7)	3m 30s
test (windows, 3.12)	3m 54s
test (ubuntu, pypy-3.9)	4m 24s
test (ubuntu, pypy-3.10)	4m 39s
test (ubuntu, 3.8)	1m 34s
test (ubuntu, 3.9)	1m 44s
test (ubuntu, 3.10)	2m 9s
test (ubuntu, 3.11, ~=0.63.3)	1m 43s
test (ubuntu, 3.11, ~=0.64.0)	1m 35s
test (ubuntu, 3.11, ~=1.0.0)	1m 44s
test (ubuntu, 3.11, ~=1.1.0)	1m 36s
test (ubuntu, 3.12, ~=1.2.3)	1m 40s
test (ubuntu, 3.12, @git+https://github.com/mesonbuild/meson.git)	1m 58s
test (windows, 3.12, @git+https://github.com/mesonbuild/meson.git)	5m 22s
	1h 0m 51s

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