Allow server bind address config specification

Use cases have been presented which limit server bind address
presentation.
Partially Fixes buildfarm#1713

examples/config.yml

@@ -9,6 +9,7 @@ server:
   name: shard
   actionCacheReadOnly: false
   port: 8980
+  bindAddress: ""
   grpcMetrics:
     enabled: true
     provideLatencyHistograms: true

src/main/java/build/buildfarm/common/config/Server.java

@@ -16,6 +16,7 @@ public enum INSTANCE_TYPE {
   private INSTANCE_TYPE instanceType = INSTANCE_TYPE.SHARD;
   private String name = "shard";
   private boolean actionCacheReadOnly = false;
+  private String bindAddress = "";
   private int port = 8980;
   private GrpcMetrics grpcMetrics = new GrpcMetrics();
   private int casWriteTimeout = 3600;

src/main/java/build/buildfarm/server/BUILD

@@ -21,6 +21,7 @@ java_library(
         "@maven//:com_google_guava_guava",
         "@maven//:io_grpc_grpc_api",
         "@maven//:io_grpc_grpc_core",
+        "@maven//:io_grpc_grpc_netty",
         "@maven//:io_grpc_grpc_services",
         "@maven//:io_grpc_grpc_util",
         "@maven//:io_prometheus_simpleclient",

src/main/java/build/buildfarm/server/BuildFarmServer.java

@@ -41,12 +41,15 @@
 import io.grpc.ServerBuilder;
 import io.grpc.ServerInterceptor;
 import io.grpc.health.v1.HealthCheckResponse.ServingStatus;
+import io.grpc.netty.NettyServerBuilder;
 import io.grpc.protobuf.services.HealthStatusManager;
 import io.grpc.protobuf.services.ProtoReflectionService;
 import io.grpc.util.TransmitStatusRuntimeExceptionInterceptor;
 import io.prometheus.client.Counter;
 import java.io.File;
 import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.SocketAddress;
 import java.security.Security;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
@@ -250,13 +253,19 @@ public static void main(String[] args) throws Exception {
 
     configs = BuildfarmConfigs.loadServerConfigs(args);
 
-    // Configure Spring
     BuildFarmServer server = new BuildFarmServer();
+    SocketAddress socketAddress;
+    if (configs.getServer().getBindAddress().isEmpty()) {
+      socketAddress = new InetSocketAddress(configs.getServer().getPort());
+    } else {
+      socketAddress =
+          new InetSocketAddress(
+              configs.getServer().getBindAddress(), configs.getServer().getPort());
+    }
 
     try {
       server.start(
-          ServerBuilder.forPort(configs.getServer().getPort()),
-          configs.getServer().getPublicName());
+          NettyServerBuilder.forAddress(socketAddress), configs.getServer().getPublicName());
       server.awaitTermination();
     } catch (IOException e) {
       log.severe("error: " + formatIOError(e));