add `base64url` action #1872

Job	Run time
Install packages	17s
Build and publish library	33s
Run Prettier in library	33s
Run ESLint in library	49s
Run Vitest in library	36s
Run ESLint in packages/to-json-schema	26s
Run Prettier in packages/to-json-schema	19s
Run Vitest in packages/to-json-schema	20s
Run ESLint in website	26s
Run Prettier in website	40s
	4m 59s

Provide feedback