github: cache OSBUILD_TEST_STORE accross runs #25

Job	Run time
Unittest (test.mod, py36)	46s
Unittest (test.mod, py39)	43s
Unittest (test.mod, py311)	44s
Unittest (test.mod, py312)	40s
Unittest (test.run.test_assemblers, py36)	39s
Unittest (test.run.test_assemblers, py39)	55s
Unittest (test.run.test_assemblers, py311)	35s
Unittest (test.run.test_assemblers, py312)	34s
Unittest (test.run.test_boot, py36)	34s
Unittest (test.run.test_boot, py39)	53s
Unittest (test.run.test_boot, py311)	57s
Unittest (test.run.test_boot, py312)	41s
Unittest (test.run.test_devices, py36)	42s
Unittest (test.run.test_devices, py39)	42s
Unittest (test.run.test_devices, py311)	40s
Unittest (test.run.test_devices, py312)	42s
Unittest (test.run.test_executable, py36)	40s
Unittest (test.run.test_executable, py39)	35s
Unittest (test.run.test_executable, py311)	34s
Unittest (test.run.test_executable, py312)	50s
Unittest (test.run.test_mount, py36)	41s
Unittest (test.run.test_mount, py39)	33s
Unittest (test.run.test_mount, py311)	48s
Unittest (test.run.test_mount, py312)	42s
Unittest (test.run.test_noop, py36)	52s
Unittest (test.run.test_noop, py39)	39s
Unittest (test.run.test_noop, py311)	46s
Unittest (test.run.test_noop, py312)	42s
Unittest (test.run.test_sources, py36)	36s
Unittest (test.run.test_sources, py39)	33s
Unittest (test.run.test_sources, py311)	48s
Unittest (test.run.test_sources, py312)	34s
Unittest (test.run.test_stages, py36)	33s
Unittest (test.run.test_stages, py39)	37s
Unittest (test.run.test_stages, py311)	33s
Unittest (test.run.test_stages, py312)	45s
	24m 48s

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