fix: 完善ustreamer编译缓存解决方案

- 在编译完成后将目录重命名为标准路径 /tmp/ustreamer
- 确保后续构建步骤能正确引用 ustreamer 二进制文件
- 保持缓存破坏机制的同时维护构建流程的兼容性

build/Dockerfile-stage-0

@@ -132,13 +132,14 @@ RUN git clone --depth=1 https://gitlab.freedesktop.org/libnice/libnice /tmp/libn
     && rm -rf /tmp/janus-gateway
 
 # 编译 ustreamer
-ARG CACHEBUST=1
-RUN echo "Cache bust: $CACHEBUST" \
+RUN echo "Building ustreamer with timestamp cache bust" \
     && sed --in-place --expression 's|^#include "refcount.h"$|#include "../refcount.h"|g' /usr/include/janus/plugins/plugin.h \
-    && git clone --depth=1 https://github.com/mofeng-git/ustreamer /tmp/ustreamer \
-    && make -j WITH_PYTHON=1 WITH_JANUS=1 WITH_FFMPEG=1 -C /tmp/ustreamer \
-    && /tmp/ustreamer/ustreamer -v \
-    && cp /tmp/ustreamer/python/dist/*.whl /tmp/wheel/
+    && TIMESTAMP=$(date +%s%N) \
+    && git clone --depth=1 https://github.com/mofeng-git/ustreamer /tmp/ustreamer-${TIMESTAMP} \
+    && make -j WITH_PYTHON=1 WITH_JANUS=1 WITH_FFMPEG=1 -C /tmp/ustreamer-${TIMESTAMP} \
+    && /tmp/ustreamer-${TIMESTAMP}/ustreamer -v \
+    && cp /tmp/ustreamer-${TIMESTAMP}/python/dist/*.whl /tmp/wheel/ \
+    && mv /tmp/ustreamer-${TIMESTAMP} /tmp/ustreamer
 
 # 复制必要的库文件
 RUN mkdir /tmp/lib \