Update Dockerfile

Add ffmpeg for vod.

Dockerfile

@@ -4,7 +4,7 @@ ENV LANG C.UTF-8
 RUN sed -i 's@http://archive.ubuntu.com/ubuntu/@http://mirrors.aliyun.com/ubuntu/@g' /etc/apt/sources.list 
 
 RUN apt-get update -q \
-    && apt-get install -y git 
+    && apt-get install -y git ffmpeg
 
 RUN mkdir -p /root/openpilot
 WORKDIR /root/openpilot
@@ -15,4 +15,9 @@ WORKDIR /root/openpilot/openpilot-server
 # replace config with your domain
 RUN sed -i 's@laolang.duckdns.org@your_domain@g' /root/openpilot/openpilot-server/config.txt 
 
+RUN sed -i 's@D:\\\\software\\\\ffmpeg.exe@ffmpeg@g' /root/openpilot/openpilot-server/config.txt 
+
+#COPY op ./op
+RUN mkdir op
+
 ENTRYPOINT ["/root/openpilot/openpilot-server/opserver_linux_amd64"]