ENH: Multi-threaded building in CI pipeline.

.gitlab-ci.yml

@@ -89,8 +89,8 @@ test:
     - echo "FILE_TO_BE_PATCHED=$FILE_TO_BE_PATCHED"
     - sed -e "s|std::unique_ptr<ContextAllocator> context_allocator) {}|std::unique_ptr<ContextAllocator> /*context_allocator*/) {}|" -i $FILE_TO_BE_PATCHED
     - cmake -DCMAKE_BUILD_TYPE=Debug ..
-    - cmake --build .
-    - cmake --build . --target unit_test_coverage
+    - cmake --build -j .
+    - cmake --build -j . --target unit_test_coverage
 
 # trigger the integration tests
 trigger_inttest: