Add ingress for rewriting Keycloak requests from /auth to / #784

Job	Run time
test (builtin)	57s
test (builtin-auth-rewrite)	53s
editorconfig	30s
linting (lint_jsonnet)	11s
golden (builtin)	20s
test (external)	58s
linting (lint_yaml)	5s
test (openshift)	59s
golden (builtin-auth-rewrite)	23s
linting (lint_adoc)	12s
test (openshift-auth-rewrite)	1m 5s
golden (external)	28s
test (openshift-postgres)	1m 2s
golden (openshift)	31s
golden (openshift-auth-rewrite)	25s
golden (openshift-postgres)	25s
	9m 24s

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