Add Docker build scripts

[neckro]

To install Docker: sudo curl -fsSL https://get.docker.com | sh

If you want to use Docker as not-root, add your account to the docker group afterwards.

Once Docker is installed, running docker-services.sh from the repo dir should automatically build the two Docker images, destroy any old running images, and bring up the new ones. The Docker build takes about 30 minutes from scratch.

docker-play.sh has some test parameters and is a WIP.

[TheOpponent]

Mr. OTCS was updated to v1.1.0. The new (minimal) build command for ffmpeg-hls-pts-discontinuity-reclock is:

cd ~ && git clone --depth 1 https://github.com/jjustman/ffmpeg-hls-pts-discontinuity-reclock.git \
  && cd ~/ffmpeg-hls-pts-discontinuity-reclock \
  && ./configure \
    --extra-cflags="-I/usr/local/include" \
    --extra-ldflags="-L/usr/local/lib" \
    --extra-libs="-lpthread -lm -latomic" \
    --arch=armel \
    --enable-mmal \
    --enable-omx \
    --enable-omx-rpi \
    --enable-gpl \
    --enable-libfdk-aac \
    --disable-librtmp \
    --enable-libx264 \
    --enable-nonfree \
    --target-os=linux \
    --enable-pthreads \
    --enable-hardcoded-tables \
    --disable-doc \
  && make -j$(nproc) \
  && sudo make install

libomxil-bellagio-dev will need to be installed before compilation, and gpu_mem=256 should be set in /boot/config.txt.