fix(docker) squelch warning about libraries not being symlinks

The COPY operation with a glob pattern will resolve symlinks but we
don't want that, we want them to be copied as symlinks. To that end,
prepare a temporary directory and copy the whole directory. In that
case, Docker does not resolve symlinks for the files within.

Dockerfile

@@ -71,13 +71,16 @@ RUN \
     make install && \
     ldconfig
 
+WORKDIR /copy_libs
+RUN cp -a /usr/local/lib/lib* ./
+
 ## Production Image
 
 FROM ${BASE_IMAGE_RUN}
 
 COPY --chown=jitsi:jitsi docker/run-skynet.sh /opt/
 COPY --from=ffmpeg_builder /usr/local/include /usr/local/include
-COPY --from=ffmpeg_builder /usr/local/lib/lib* /usr/local/lib/
+COPY --from=ffmpeg_builder /copy_libs/ /usr/local/lib/
 COPY --from=ffmpeg_builder /usr/local/lib/pkgconfig /usr/local/lib/pkgconfig
 COPY --chown=jitsi:jitsi --from=builder /app/.venv /app/.venv