website/integrations: gravity: add #28872

Job	Run time
lint-golint	1m 9s
test-unittest	3m 28s
ci-outpost-mark	1s
build-container (proxy)	3m 9s
build-binary (proxy, linux, amd64)	2m 13s
build-container (ldap)	2m 25s
build-binary (proxy, linux, arm64)	2m 10s
build-container (radius)	2m 38s
build-binary (ldap, linux, amd64)	1m 55s
build-container (rac)	2m 24s
build-binary (ldap, linux, arm64)	2m 12s
build-binary (radius, linux, amd64)	1m 57s
build-binary (radius, linux, arm64)	2m 8s
build-binary (rac, linux, amd64)	1m 54s
build-binary (rac, linux, arm64)	2m 32s
	32m 15s

Provide feedback