Add CI test for t8code with shipped submodules #70

Job	Run time
t8code_w_shipped_submodules_tests / t8code_cmake_tests	6m 43s
preparation (ON) / cmake_preparation	59s
preparation (OFF) / cmake_preparation	59s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	3m 0s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	2m 10s
t8code_tests (OFF, Debug) / t8code_cmake_tests	3m 0s
t8code_tests (OFF, Release) / t8code_cmake_tests	2m 36s
t8code_tests (ON, Debug) / t8code_cmake_tests	30m 2s
t8code_tests (ON, Release) / t8code_cmake_tests	30m 3s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	8m 4s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	7m 16s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	42m 46s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	40m 35s
	2h 58m 13s

Provide feedback