deploy: add /releases to build.golang.org

This mounts relui to the appropriate locaiton.

For golang/go#47401

Change-Id: I247ac925b47206acc2a6b4a109da003645af3a68
Reviewed-on: https://go-review.googlesource.com/c/build/+/363696
Trust: Alexander Rakoczy <alex@golang.org>
Run-TryBot: Alexander Rakoczy <alex@golang.org>
Reviewed-by: Heschi Kreinick <heschi@google.com>
TryBot-Result: Go Bot <gobot@golang.org>

deploy/build-ingress.yaml

diff --git a/deploy/build-ingress.yaml b/deploy/build-ingress.yaml
index 4fa28e8..468274c 100644
--- a/deploy/build-ingress.yaml
+++ b/deploy/build-ingress.yaml
@@ -37,6 +37,13 @@
             name: coordinator-internal
             port:
               number: 444
+      - pathType: ImplementationSpecific
+        path: /releases
+        backend:
+          service:
+            name: relui-internal
+            port:
+              number: 444
   - host: dev.golang.org
     http:
       paths: