fix source check for Python (did nothing)

also include submodule checkout in source test

Author: MarDiehl

.gitlab-ci.yml

@@ -138,6 +138,7 @@ core:
       for COMMIT in ${COMMITS};do
         printf "%b" "\e[1;32m::\nchecking commit ${COMMIT}\n::\e[0m\n"
         git checkout ${COMMIT}
+        git submodule update --init
         cmake -DGRID=ON -DMESH=ON -B build && cmake --build build --parallel 4 --target install
       done
 
@@ -150,6 +151,7 @@ processing:
       COMMITS=$(git log --reverse --format=format:%H origin/$CI_MERGE_REQUEST_TARGET_BRANCH_NAME..$CI_COMMIT_SHA)
       for COMMIT in ${COMMITS};do
         printf "%b" "\e[1;32m::\nchecking commit ${COMMIT}\n::.\e[0m\n"
+        git checkout ${COMMIT}
         python -c 'import damask;print(damask.__version__)'
       done