Package source files and update actions #201

Job	Run time
t8code_w_shipped_submodules_tests / t8code_cmake_tests	4m 5s
preparation (OFF) / cmake_preparation	1m 44s
preparation (ON) / cmake_preparation	1m 15s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	3m 58s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	8m 2s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	3m 2s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	10m 23s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	6m 54s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	7m 11s
t8code_tests (OFF, Debug) / t8code_cmake_tests	3m 12s
t8code_tests (OFF, Release) / t8code_cmake_tests	2m 42s
t8code_tests (ON, Debug) / t8code_cmake_tests	3m 59s
t8code_tests (ON, Release) / t8code_cmake_tests	2m 50s
	59m 17s

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