[scripts][before_test] Use gitlab runner id for build container

Use mv rather than ln to handle algorithm libraries.

scripts/before_test.sh

@@ -68,8 +68,7 @@ check_env BEAT_CORE_TEST_DIR
 if [ "$1" == "build" ]; then
     for k in "${ALGORITHMS[@]}"; do
         algodir=$(dirname "${k}")
-        run_cmd docker run --rm --volume="${CI_PROJECT_DIR}/scripts/build.sh:/build.sh" --volume="${BEAT_CORE_TEST_DIR}/${algodir}:/sources" --workdir="/sources" --entrypoint="bash" "${BEAT_CXX_DEV_ENVIRONMENT}" /build.sh
-        run_cmd ln -sf "${BEAT_CORE_TEST_DIR}/${algodir}/build/*.so" "${BEAT_CORE_TEST_DIR}/${algodir}";
+        run_cmd docker run --rm --user=$(id -u gitlab-runner):$(id -g gitlab-runner) --volume="${CI_PROJECT_DIR}/scripts/build.sh:/build.sh" --volume="${BEAT_CORE_TEST_DIR}/${algodir}:/sources" --workdir="/sources" --entrypoint="bash" "${BEAT_CXX_DEV_ENVIRONMENT}" /build.sh
     done
 fi