fix: pin protoc versions

Author: allnil

Cargo.toml

@@ -85,6 +85,7 @@ merkle_proof = { git = "https://github.com/sigp/lighthouse.git", package = "merk
 prost = "0.13"
 prost-build = "0.13"
 prost-types = "0.13"
+protoc-bin-vendored = "3.2.0"
 rand = { version = "0.8.5", features = ["std_rng"] }
 redb = "3.0.0"
 reqwest = { version = "0.12", default-features = false, features = ["json", "multipart", "rustls-tls"] }

crates/types/Cargo.toml

@@ -48,6 +48,7 @@ async-trait.workspace = true
 
 [build-dependencies]
 prost-build = { workspace = true }
+protoc-bin-vendored = { workspace = true }
 
 [lints]
 workspace = true

crates/types/build.rs

@@ -1,6 +1,7 @@
 #![allow(missing_docs)]
 
 use std::io::Result;
+use std::env;
 
 fn main() -> Result<()> {
     let protos = &["proto/consensus.proto", "proto/sync.proto", "proto/liveness.proto"];
@@ -9,6 +10,12 @@ fn main() -> Result<()> {
         println!("cargo:rerun-if-changed={proto}");
     }
 
+    if env::var("PROTOC").is_err() {
+        let protoc = protoc_bin_vendored::protoc_bin_path()
+            .map_err(|error| std::io::Error::new(std::io::ErrorKind::Other, error))?;
+        env::set_var("PROTOC", protoc);
+    }
+
     let mut config = prost_build::Config::new();
     config.enable_type_names();
     config.bytes(["."]);