Enable libvpx

Dockerfile

@@ -9,6 +9,7 @@ RUN apt update && \
     build-essential \
     libx264-dev \
     libwebp-dev \
+    libvpx-dev \
     nasm \
     libclang-dev && \
     rm -rf /var/lib/apt/lists/*
@@ -23,6 +24,7 @@ RUN git clone --depth=1 https://git.ffmpeg.org/ffmpeg.git && \
     --enable-version3 \
     --enable-libx264 \
     --enable-libwebp \
+    --enable-libvpx \
     --disable-static \
     --enable-shared && \
     make -j8 && make install