Add XDG_RUNTIME_DIR=/tmp to fix wineboot --init bug

Dockerfile

@@ -62,6 +62,7 @@ ENV XVFB_SCREEN "0"
 ENV XVFB_RESOLUTION "1024x768x16"
 ENV DISPLAY ":95"
 ENV WINEARCH win32
+ENV XDG_RUNTIME_DIR "/tmp"
 
 COPY tools/* /root/.wine/drive_c/windows/system32/
 COPY VisualStudioMock/bin/Release/net472/VisualStudioMock.exe /root/.wine/drive_c/VisualStudioMock.exe
@@ -70,7 +71,7 @@ RUN set -x -e; \
     export PATH=/opt/wine-stable/bin:$PATH; \
 		# Install dotnet
     entrypoint wineboot --init; \
-    # HACK for Wine 10 bug where the previous ends with "run_wineboot boot event wait timed out"
+    # HACK for Wine 10 bug where the previous ends with "run_wineboot boot event wait timed out" (https://bugs.mandrivalinux.com.narkive.com/hFZTjKnl/bug-58914-wine-new-wine-hangs-while-creating-initial-configuration-in-wine)
     kill `pgrep rundll32`; \
     kill `pgrep control.exe`; \
     entrypoint wineboot --init; \