Update Dockerfile

Dockerfile

@@ -1,13 +1,12 @@
 FROM python:3.9-slim
 
 WORKDIR /app
-RUN apt-get update
+RUN apt-get update && apt-get install -y software-properties-common
 RUN add-apt-repository -y ppa:savoury1/ffmpeg4 
 RUN apt-get update && apt-get -qq install -y ffmpeg
 RUN apt-get install \
     build-essential \
     curl \
-    software-properties-common \
     git \
     && rm -rf /var/lib/apt/lists/*