feat: add protobuf

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/flux-releaser/build.rs

@@ -0,0 +1,26 @@
+use std::path::PathBuf;
+
+fn main() {
+    let proto_dir = PathBuf::from(std::env!("CARGO_MANIFEST_DIR"))
+        .join("schemas")
+        .join("proto");
+
+    let proto_files = proto_dir
+        .read_dir()
+        .unwrap()
+        .flatten()
+        .map(|e| (e.path(), e.metadata()))
+        .filter_map(|(path, file_type)| {
+            file_type
+                .ok()
+                .filter(|file_type| file_type.is_file())
+                .map(|_| path)
+        })
+        .collect::<Vec<_>>();
+
+    if proto_files.is_empty() {
+        panic!("failed to find any proto files in {}", proto_dir.display());
+    }
+
+    tonic_build::compile_protos(proto_files.first().unwrap()).unwrap();
+}