Add workflow to check JSON Schema #246

Job	Run time
R Package Checks / revdeps-check	0s
R Package Checks / codecov / test-coverage (ubuntu-latest)	2m 16s
R Package Checks / docs-check / docs-check	1m 36s
R Package Checks / deps-main-check / deps-main	2m 7s
R Package Checks / codecov / test-coverage (windows-latest)	2m 22s
R Package Checks / codecov / test-coverage (macOS-latest)	1m 10s
R Package Checks / check-R-updates / updated-files	4s
R Package Checks / lintr / lint	2m 43s
R Package Checks / r-cmd-check / macOS-latest (release)	1m 22s
R Package Checks / r-cmd-check / windows-latest (release)	2m 47s
R Package Checks / r-cmd-check / windows-latest (4.1)	4m 45s
R Package Checks / r-cmd-check / ubuntu-latest (release)	3m 3s
R Package Checks / r-cmd-check / ubuntu-latest (devel)	3m 2s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-1)	1m 45s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-2)	3m 13s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-3)	3m 33s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-4)	2m 35s
R Package Checks / version-check / version-check	1m 29s
	39m 52s

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