Add ingress for rewriting Keycloak requests from /auth to / #638

Job	Run time
editorconfig	8s
linting (lint_jsonnet)	11s
golden (builtin)	23s
linting (lint_yaml)	10s
golden (builtin-auth-rewrite)	30s
test (builtin)	1m 17s
linting (lint_adoc)	10s
golden (external)	23s
test (builtin-auth-rewrite)	1m 26s
golden (openshift)	28s
test (external)	1m 42s
golden (openshift-auth-rewrite)	27s
test (openshift)	1m 9s
golden (openshift-postgres)	20s
test (openshift-auth-rewrite)	1m 27s
test (openshift-postgres)	1m 29s
	11m 40s

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