Add `image_math` tool (#107) #273

Job	Run time
Setup cache and determine changed repositories (3.11)	4m 49s
Lint R scripts (ubuntu-20.04, release)	2m 23s
Lint tool-list (3.11)	35s
Lint Python scripts	0s
Check file sizes	0s
Test tools (0, 3.11)	6m 0s
Combine chunked test results (3.11)	45s
Deploy (3.11)	46s
Check workflow success	0s
Report deploy status	0s
	15m 18s

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