add ffmpeg

Author: jxxghp

Dockerfile

@@ -32,6 +32,7 @@ RUN apt-get update -y \
         haproxy \
         fuse3 \
         rsync \
+        ffmpeg \
     && \
     if [ "$(uname -m)" = "x86_64" ]; \
         then ln -s /usr/lib/x86_64-linux-musl/libc.so /lib/libc.musl-x86_64.so.1; \