Change index url per NEED_MIRROR (#4515)

### What problem does this PR solve?

Change index url per NEED_MIRROR. Close #4507

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

Dockerfile

@@ -130,7 +130,14 @@ WORKDIR /ragflow
 # install dependencies from uv.lock file
 COPY pyproject.toml uv.lock ./
 
+# https://github.com/astral-sh/uv/issues/10462
+# uv records index url into uv.lock but doesn't failover among multiple indexes
 RUN --mount=type=cache,id=ragflow_uv,target=/root/.cache/uv,sharing=locked \
+    if [ "$NEED_MIRROR" == "1" ]; then \
+        sed -i 's|pypi.org|pypi.tuna.tsinghua.edu.cn|g' uv.lock; \
+    else \
+        sed -i 's|pypi.tuna.tsinghua.edu.cn|pypi.org|g' uv.lock; \
+    fi; \
     if [ "$LIGHTEN" == "1" ]; then \
         uv sync --python 3.10 --frozen; \
     else \