perf: fix Dockerfile-base

Author: LeeEirc

Dockerfile-base

@@ -68,5 +68,5 @@ RUN set -ex \
     && mkdir -p /root/.m2 \
     && mkdir -p /opt/chen/frontend/dist \
     && sed -i "s@https://repo.maven.apache.org/maven2@${MAVEN_MIRROR}@g" settings.xml \
-    && \cp -f settings.xml /root/.m2/ \
+    && cp -f settings.xml /root/.m2/ \
     && mvn clean install