Properly add ffmpeg to the dockerfile install sequence

Dockerfile

@@ -7,7 +7,7 @@ ENV DEBIAN_FRONTEND=noninteractive
 # Install system dependencies
 RUN apt-get update && \
     apt-get upgrade -y && \ 
-    apt-get install git pulseaudio pulseaudio-utils liquidsoap -y
+    apt-get install git pulseaudio pulseaudio-utils liquidsoap ffmpeg -y
 
 # Clone the boatbod op25 repository
 RUN git clone -b gr310 https://github.com/boatbod/op25 /op25
@@ -37,11 +37,6 @@ VOLUME ["/configs"]
 # Create the calls local cache directory
 VOLUME ["/calls"]
 
-
-##### REMOVE ME OR PROPERLY ADD IF WORKS
-RUN apt-get install ffmpeg -y
-##### REMOVE ME OR PROPERLY ADD IF WORKS
-
 # Set the working directory in the container
 WORKDIR /app