Docker: Add ci-otio image (#1278)

This includes both, the Python and C++ version. We basically just need the headers and libopentime(line).so

* Add label for VFXPLATFORM_VERSION
* org.opencontainers.image.licenses defaults to GPL-2.0-only?!

docker/ci-ffmpeg/Dockerfile

@@ -27,13 +27,13 @@ ARG OPUS_VERSION
 ARG NUM_JOBS=2
 
 LABEL maintainer="olivevideoeditor@gmail.com"
-
 LABEL org.opencontainers.image.name="$OLIVE_ORG/ci-ffmpeg"
 LABEL org.opencontainers.image.description="CentOS FFmpeg Build Image"
 LABEL org.opencontainers.image.url="http://olivevideoeditor.org"
 LABEL org.opencontainers.image.source="https://github.com/olive-editor/olive"
 LABEL org.opencontainers.image.vendor="Olive Team"
 LABEL org.opencontainers.image.version="1.0"
+LABEL org.opencontainers.image.licenses="GPL-3.0-or-later"
 
 COPY scripts/build_ffmpeg.sh \
      /tmp/