ci: add openapi spec drift check on PRs #433

Job	Run time
Local / file / pg / single	1m 0s
Local / s3 / oriole / single	1m 24s
Local / file / oriole / multitenant	1m 35s
Local / s3 / oriole / multitenant	1m 23s
Local / s3 / multigres / single	1m 16s
Local / file / multigres / multitenant	1m 20s
Local / file / multigres / single	1m 25s
Local / s3 / pg / multitenant	1m 5s
Local / file / oriole / single	2m 0s
Local / s3 / multigres / multitenant	1m 15s
Local / s3 / pg / single	58s
Local / file / pg / multitenant	1m 7s
Remote	-8s
	15m 40s

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