Add workflow to check JSON Schema #241

Job	Run time
R Package Checks / revdeps-check	0s
R Package Checks / codecov / test-coverage (ubuntu-latest)	1m 14s
R Package Checks / lintr / lint	1m 28s
R Package Checks / codecov / test-coverage (windows-latest)	2m 22s
R Package Checks / codecov / test-coverage (macOS-latest)	1m 15s
R Package Checks / check-R-updates / updated-files	5s
R Package Checks / r-cmd-check / macOS-latest (release)	1m 25s
R Package Checks / deps-main-check / deps-main	1m 22s
R Package Checks / r-cmd-check / windows-latest (release)	2m 58s
R Package Checks / docs-check / docs-check	1m 14s
R Package Checks / r-cmd-check / windows-latest (4.1)	7m 0s
R Package Checks / r-cmd-check / ubuntu-latest (release)	2m 18s
R Package Checks / r-cmd-check / ubuntu-latest (devel)	1m 24s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-1)	1m 18s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-2)	2m 4s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-3)	1m 42s
R Package Checks / r-cmd-check / ubuntu-latest (oldrel-4)	1m 26s
R Package Checks / version-check	0s
	30m 35s

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