Fix port bind

Author: daemonl

ext/o5/app.yaml

@@ -51,8 +51,8 @@ runtimes:
           - name: POSTGRES_URL
             database:
               databaseName: main
-          - name: PUBLIC_PORT
-            value: "8080"
+          - name: GRPC_BIND
+            value: ":8080"
           - name: SLACK_URL
             secret:
               secretName: slack