Add lottie-to-webm converter #172

Job	Run time
Build Windows executable / Build Windows executable	2m 55s
Build Darwin executable / Build MacOS executable	1m 41s
Build Docker image & Linux executable (arm64) / Build linux and docker images	21m 27s
Build Docker image & Linux executable (amd64) / Build linux and docker images	3m 47s
Test on Darwin / Test on Darwin (apng)	1m 36s
Test on Darwin / Test on Darwin (gif)	1m 20s
Test on Darwin / Test on Darwin (png)	29s
Test on Darwin / Test on Darwin (webp)	33s
Test on Darwin / Test on Darwin (webm)	1m 27s
Test on Windows / Test Windows (apng)	35s
Test on Windows / Test Windows (gif)	1m 44s
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 23s
Run tests on Docker (arm64) / Run docker tests (gif)	2m 20s
Run tests on Docker (arm64) / Run docker tests (png)	1m 41s
Run tests on Docker (amd64) / Run docker tests (apng)	29s
Run tests on Docker (arm64) / Run docker tests (webp)	1m 45s
Run tests on Docker (amd64) / Run docker tests (gif)	17s
Run tests on Docker (arm64) / Run docker tests (webm)	6m 7s
Run tests on Docker (amd64) / Run docker tests (png)	45s
Run tests on Docker (amd64) / Run docker tests (webp)	24s
Run tests on Docker (amd64) / Run docker tests (webm)	26s
	55m 28s

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