feat(health): Expose grpc_health_v1 file descriptor set (#620)

tonic-health/build.rs

@@ -1,5 +1,11 @@
+use std::env;
+use std::path::PathBuf;
+
 fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let grpc_health_v1_descriptor_set_path: PathBuf =
+        PathBuf::from(env::var("OUT_DIR").unwrap()).join("grpc_health_v1.bin");
     tonic_build::configure()
+        .file_descriptor_set_path(grpc_health_v1_descriptor_set_path)
         .build_server(true)
         .build_client(true)
         .format(false)

tonic-health/src/lib.rs

@@ -28,6 +28,9 @@ pub mod proto {
     #![allow(unreachable_pub)]
     #![allow(missing_docs)]
     tonic::include_proto!("grpc.health.v1");
+
+    pub const GRPC_HEALTH_V1_FILE_DESCRIPTOR_SET: &'static [u8] =
+        tonic::include_file_descriptor_set!("grpc_health_v1");
 }
 
 pub mod server;