Add ingress for rewriting Keycloak requests from /auth to / #732

Job	Run time
linting (lint_jsonnet)	5s
linting (lint_yaml)	6s
editorconfig	4s
linting (lint_adoc)	6s
test (builtin)	55s
golden (builtin)	20s
test (builtin-auth-rewrite)	59s
golden (builtin-auth-rewrite)	23s
test (external)	53s
golden (external)	20s
test (openshift)	1m 1s
golden (openshift)	21s
test (openshift-auth-rewrite)	56s
golden (openshift-auth-rewrite)	21s
test (openshift-postgres)	56s
golden (openshift-postgres)	21s
	8m 7s

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