fix: use absolute path of package (#313)

Makefile

@@ -552,7 +552,7 @@ ci-test-python: ## Run Python unit tests. Assumes the dev image has already been
 	--volume="/app/build" \
 	--workdir=/app/build \
 	$(docker_development_image_repository):$(docker_image_version) \
-	/bin/bash -c "python${test_python_version} -m pip install --root-user-action=ignore --target=${test_python_directory} --find-links packages/python open_space_toolkit_${project_name} \
+	/bin/bash -c "python${test_python_version} -m pip install --root-user-action=ignore --target=${test_python_directory} --find-links /app/packages/python open_space_toolkit_${project_name} \
 	&& python${test_python_version} -m pip install --root-user-action=ignore --target=${test_python_directory} plotly pandas \
 	&& cd ${test_python_directory}/ostk/$(project_name)/ \
 	&& python${test_python_version} -m pytest -sv ."