Use git submodule for protobuf repo

.gitignore

@@ -1,2 +1 @@
 /target
-/protobufs

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "protobufs"]
+	path = protobufs
+	url = https://github.com/meshtastic/protobufs.git

Cargo.toml

@@ -10,5 +10,4 @@ bytes = "1.5.0"
 prost = "0.12.3"
 
 [build-dependencies]
-git2 = "0.18.1"
 prost-build = "0.12.3"

build.rs

@@ -1,7 +1,5 @@
-extern crate git2;
 extern crate prost_build;
 
-use git2::Repository;
 use prost_build::compile_protos;
 use std::path::Path;
 
@@ -13,23 +11,8 @@ fn update_repo(path: &Path) -> Result<(), git2::Error> {
 }
 
 fn main() {
-    let repo = "https://github.com/meshtastic/protobufs.git";
     let path = Path::new("protobufs");
 
-    if path.exists() {
-        if let Err(e) = update_repo(path) {
-            eprintln!("Error could not update meshtastic protobuf repo");
-            eprintln!("{e}");
-            std::process::exit(1);
-        }
-    } else {
-        if let Err(e) = Repository::clone(repo, path) {
-            eprintln!("Error could not clone meshtastic protobuf repo");
-            eprintln!("{e}");
-            std::process::exit(1);
-        }
-    }
-
     let protos = &["protobufs/meshtastic/mesh.proto"];
     let includes = &["protobufs"];
 

protobufs

@@ -0,0 +1 @@
+Subproject commit b508d2e7ced34c752533eb02786e37402cc5a184