Dockerfile no longer works after ffmpeg update

[Elliott Balsley]

The docker build command fails because it's looking for a folder called ffmpeg-git-20220622-amd64-static. The archive at https://johnvansickle.com/ffmpeg/builds/ffmpeg-git-amd64-static.tar.xz has since been updated to ffmpeg-git-20220722-amd64-static.
As a quick and dirty fix, you could just change the Dockerfile line to mv ffmpeg-git-* ffmpeg && \.

[Zhi Li]

Thanks for the tip. let me upate it.