Add mimetype for ReStructuredText #2473

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.2, main)	1m 8s
integration-sqlite (collaboration_features, 8.2, main)	6m 8s
integration-sqlite (comments_features, 8.2, main)	6m 6s
integration-sqlite (dav_features, 8.2, main)	9m 42s
integration-sqlite (features, 8.2, main)	12m 12s
integration-sqlite (federation_features, 8.2, main)	7m 38s
integration-sqlite (--tags ~@large files_features, 8.2, main)	7m 2s
integration-sqlite (filesdrop_features, 8.2, main)	4m 7s
integration-sqlite (openldap_features, 8.2, main)	4m 29s
integration-sqlite (openldap_numerical_features, 8.2, main)	4m 16s
integration-sqlite (ldap_features, 8.2, main)	4m 35s
integration-sqlite (remoteapi_features, 8.2, main)	4m 42s
integration-sqlite (setup_features, 8.2, main)	3m 29s
integration-sqlite (sharees_features, 8.2, main)	7m 12s
integration-sqlite (sharing_features, 8.2, main)	21m 42s
integration-sqlite (videoverification_features, 8.2, main)	3m 30s
integration-sqlite-summary	4s
	1h 48m 9s

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