build: try to reduce image size.

Author: liqiang-fit2cloud

installer/Dockerfile

@@ -31,7 +31,6 @@ RUN rm -rf /opt/maxkb-app/ui && \
     export PIP_TARGET=/opt/maxkb-app/sandbox/python-packages && \
     pip install requests pymysql psycopg2-binary && \
     rm -rf /opt/maxkb-app/installer
-COPY --from=web-build ui /opt/maxkb-app/ui
 
 FROM ghcr.io/1panel-dev/maxkb-base:python3.11-pg17.5
 ARG DOCKER_IMAGE_TAG=dev \
@@ -62,6 +61,7 @@ ENV MAXKB_VERSION="${DOCKER_IMAGE_TAG} (build at ${BUILD_AT}, commit: ${GITHUB_C
 
 WORKDIR /opt/maxkb-app
 COPY --from=stage-build /opt/maxkb-app /opt/maxkb-app
+COPY --from=web-build ui /opt/maxkb-app/ui
 COPY --from=stage-build /opt/py3 /opt/py3
 
 RUN chmod 755 /tmp