Add lottie-to-webm converter #29

Job	Run time
Build Darwin executable / Build MacOS executable	1m 41s
Build Windows executable / Build Windows executable	1m 56s
Build Docker image & Linux executable (amd64) / Build linux and docker images	3m 20s
Build Docker image & Linux executable (arm64) / Build linux and docker images	17m 57s
Release executables (linux.amd64)	5s
Push images to DockerHub (lottie-to-apng, amd64)	18s
Release executables (linux.arm64)	4s
Push images to DockerHub (lottie-to-apng, arm64)	17s
Release executables (darwin.amd64)	5s
Push images to DockerHub (lottie-to-gif, amd64)	14s
Release executables (windows.amd64.exe)	5s
Push images to DockerHub (lottie-to-gif, arm64)	10s
Push images to DockerHub (lottie-to-png, amd64)	9s
Push images to DockerHub (lottie-to-png, arm64)	8s
Push images to DockerHub (lottie-to-webp, amd64)	12s
Push images to DockerHub (lottie-to-webp, arm64)	6s
Push images to DockerHub (lottie-to-webm, amd64)	12s
Push images to DockerHub (lottie-to-webm, arm64)	11s
Push manifest to DockerHub (apng)	15s
Push manifest to DockerHub (gif)	4s
Push manifest to DockerHub (png)	6s
Push manifest to DockerHub (webp)	8s
Push manifest to DockerHub (webm)	6s
	27m 49s

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