Dockerfile: simplify further, change entrypoint to vmaf CLI (#1340)

* Dockerfile: simplify further, change entrypoint to vmaf CLI

* Dockerfile: add xxd dependency

Dockerfile

@@ -1,9 +1,5 @@
 FROM ubuntu:22.04
 
-# setup timezone
-ENV TZ=UTC
-RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
-
 # get and install building tools
 RUN apt-get update && \
     apt-get install -y \
@@ -12,11 +8,9 @@ RUN apt-get update && \
     nasm \
     doxygen \
     python3 \
-    python3-dev \
     python3-pip \
-    python3-setuptools \
-    python3-wheel \
-    python3-venv
+    python3-venv \
+    xxd
 
 # retrieve source code
 COPY . /vmaf
@@ -34,4 +28,4 @@ WORKDIR /vmaf
 
 ENV PYTHONPATH=python
 
-ENTRYPOINT [ "./python/vmaf/script/run_vmaf.py" ]
+ENTRYPOINT [ "vmaf" ]