Add ingress for rewriting Keycloak requests from /auth to / #785

Job	Run time
editorconfig	5s
linting (lint_jsonnet)	6s
test (builtin)	1m 18s
linting (lint_yaml)	7s
golden (builtin)	21s
test (builtin-auth-rewrite)	1m 16s
linting (lint_adoc)	6s
golden (builtin-auth-rewrite)	22s
test (external)	59s
golden (external)	26s
test (openshift)	55s
golden (openshift)	20s
test (openshift-auth-rewrite)	58s
golden (openshift-auth-rewrite)	21s
test (openshift-postgres)	59s
golden (openshift-postgres)	23s
	9m 2s

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