Revert to /root/.local/bin for correct XMake PATH in Dockerfile

Co-authored-by: TechQuery <19969570+TechQuery@users.noreply.github.com>

Author: Copilot

.devcontainer/Dockerfile

@@ -1,4 +1,4 @@
 FROM mcr.microsoft.com/devcontainers/cpp:debian
 
 RUN curl -fsSL https://xmake.io/shget.text | bash
-ENV PATH="${HOME}/.local/bin:${PATH}"
+ENV PATH="/root/.local/bin:${PATH}"