* Updated docker to use buildx Buildkit
* Updated github actions to include QEMU/buildx to build multiarch containers
* Removed packages after build is done
* Updated documentation to set the correct default thumbnail file name
* Parallel jobs (#1)
Implemented parallel docker builds on Github Actions
* Updated default config file in Docker container
* Replaced Pillow with ffmpeg for thumbnail converting (and updated documentation to change the default thumbnail to -thumb.jpg) (#2)
* Swapped Pillow for ffmpeg for thumbnail conversion
* Further changed default thumbname to include "-thumb" (Kodi needs this to pick up the thumbnail image)
* Added ffmpeg bitexact for reproducability
* Removed extra packages needed for Pillow
* Updated ref check (#3)
* Fixed formatting on if statement for deploy job
Co-authored-by: Maka0 <bas@oddens.net>
