web/admin: update flow background #25235

Job	Run time
lint-golint	37s
test-unittest	2m 53s
ci-outpost-mark	1s
build-binary (proxy, linux, amd64)	1m 41s
build-binary (proxy, linux, arm64)	1m 56s
build-container (proxy)	3m 14s
build-binary (ldap, linux, amd64)	1m 30s
build-container (ldap)	2m 23s
build-binary (ldap, linux, arm64)	1m 44s
build-container (radius)	2m 16s
build-binary (radius, linux, amd64)	1m 30s
build-container (rac)	2m 24s
build-binary (radius, linux, arm64)	2m 28s
build-binary (rac, linux, amd64)	1m 38s
build-binary (rac, linux, arm64)	1m 41s
	27m 56s

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