Package source files and update actions #217

Job	Run time
t8code_w_shipped_submodules_tests / t8code_cmake_tests	3m 59s
preparation (ON) / cmake_preparation	1m 22s
preparation (OFF) / cmake_preparation	1m 10s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	6m 27s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	3m 3s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	3m 39s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	7m 50s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	10m 6s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	7m 54s
t8code_tests (OFF, Debug) / t8code_cmake_tests	2m 54s
t8code_tests (OFF, Release) / t8code_cmake_tests	2m 34s
t8code_tests (ON, Debug) / t8code_cmake_tests	3m 44s
t8code_tests (ON, Release) / t8code_cmake_tests	2m 58s
	57m 40s

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