Add envoyproxy to gangway deployment (#38088)

Signed-off-by: Jakub Guzik <[email protected]>

clusters/app.ci/prow/03_deployment/gangway.yaml

@@ -79,7 +79,7 @@ objects:
           - -https-address=:8443
           - -http-address=
           - -email-domain=*
-          - -upstream=http://localhost:32000
+          - -upstream=http://localhost:32001
           - -client-id=system:serviceaccount:ci:gangway
           - -openshift-ca=/etc/pki/tls/cert.pem
           - -openshift-ca=/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
@@ -95,6 +95,8 @@ objects:
             name: gangway-tls
           - mountPath: /etc/proxy/secrets
             name: session-secret
+        - name: envoyproxy
+          image: registry.ci.openshift.org/ci/envoyproxy:latest
         - name: gangway
           image: gcr.io/k8s-prow/gangway:v20230329-c93d79fb7d
           args: