add ffmpeg tool for audio / video conversion #2727

Job	Run time
Setup cache and determine changed repositories (3.11)	5m 0s
Lint tool-list	1s
Lint Python scripts	1s
Lint R scripts	1s
Check file sizes	1s
Check workflow success	4s
Test tools	1s
Combine chunked test results	1s
Deploy	1s
Report deploy status	1s
	5m 12s

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