add ffmpeg tool for audio / video conversion #2729

Job	Run time
Setup cache and determine changed repositories (3.11)	1m 6s
Lint tool-list (3.11)	48s
Lint R scripts (ubuntu-24.04, release)	1m 5s
Test tools (0, 3.11)	6m 17s
Lint Python scripts (3.11)	21s
Check file sizes	19s
Combine chunked test results (3.11)	33s
Check workflow success	3s
Deploy	0s
Report deploy status	0s
	10m 32s

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