Minimize Docker image

Dockerfile

@@ -1,21 +1,29 @@
 FROM ubuntu
 WORKDIR /app
 ENV DEBIAN_FRONTEND=noninteractive
-RUN apt-get update && apt-get install -y \
+RUN apt-get update \
-    gstreamer1.0-libav \
+ && apt-get install --no-install-recommends -y \
-    gstreamer1.0-plugins-bad \
+    build-essential \
-    gstreamer1.0-plugins-base \
-    gstreamer1.0-plugins-good \
-    gstreamer1.0-plugins-ugly \
-    gstreamer1.0-tools \
     libjpeg-dev \
+    libpython3-dev \
     python3-gevent \
     python3-numpy \
     python3-opencv \
-    python3-flask \
     python3-pip \
+ && pip3 install \
+    aioboto3 \
+    aiohttp \
+    jpeg2dct \
+    motor \
+    prometheus_client \
+    sanic==21.6.2 \
+    sanic_prometheus \
+ && apt-get remove -y \
+    build-essential \
+    libjpeg-dev \
+    libpython3-dev \
+ && apt-get autoremove -y \
  && apt-get clean
-RUN pip3 install aioboto3 prometheus_client pymongo==3.12.2 aiohttp jpeg2dct sanic==21.6.2 sanic_prometheus motor
 COPY camdetect.py /app
 ENTRYPOINT /app/camdetect.py
 EXPOSE 5000