Add lottie-to-webm converter #173

Job	Run time
Build Windows executable / Build Windows executable	2m 28s
Build Darwin executable / Build MacOS executable	3s
Build Docker image & Linux executable (arm64) / Build linux and docker images	21m 26s
Build Docker image & Linux executable (amd64) / Build linux and docker images	3m 39s
Test on Darwin	0s
Test on Windows / Test Windows (apng)	32s
Test on Windows / Test Windows (gif)	2m 22s
Test on Windows / Test Windows (png)	1m 42s
Test on Windows / Test Windows (webm)	35s
Run tests on Docker (arm64) / Run docker tests (apng)	1m 22s
Run tests on Docker (amd64) / Run docker tests (apng)	28s
Run tests on Docker (arm64) / Run docker tests (gif)	2m 20s
Run tests on Docker (amd64) / Run docker tests (gif)	22s
Run tests on Docker (arm64) / Run docker tests (png)	1m 53s
Run tests on Docker (amd64) / Run docker tests (png)	1m 27s
Run tests on Docker (arm64) / Run docker tests (webp)	1m 44s
Run tests on Docker (amd64) / Run docker tests (webp)	21s
Run tests on Docker (arm64) / Run docker tests (webm)	6m 5s
Run tests on Docker (amd64) / Run docker tests (webm)	28s
	49m 17s

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