chore: add small rust ci to for better pr validation

.github/workflows/rust-ci.yml

@@ -0,0 +1,40 @@
+name: Rust CI
+
+on:
+  push:
+    branches: [main]
+  merge_group:
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  cargo-tests:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: taiki-e/install-action@just
+      - uses: dtolnay/rust-toolchain@stable
+      - uses: Swatinem/rust-cache@v2
+        with:
+          cache-on-failure: true
+      - uses: taiki-e/install-action@nextest
+      - name: tests
+        run: just test
+
+  cargo-lint:
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    name: lint
+    steps:
+      - uses: actions/checkout@v4
+      - uses: taiki-e/install-action@just
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rustfmt, clippy
+      - uses: Swatinem/rust-cache@v2
+        with:
+          cache-on-failure: true
+      - name: fmt + lint
+        run: just fmt

world-chain-builder/crates/toolkit/src/cli.rs

@@ -1,4 +1,4 @@
-use bytes::{Bytes, BytesMut};
+use bytes::Bytes;
 use chrono::NaiveDate;
 use clap::Parser;
 use identity_source::IdentitySource;

world-chain-builder/src/e2e_tests/mod.rs

@@ -1,10 +1,12 @@
 //! Utilities for running world chain builder end-to-end tests.
 use crate::{
+    date_marker::DateMarker,
+    external_nullifier::ExternalNullifier,
     node::{
         args::{ExtArgs, WorldChainBuilderArgs},
         builder::{WorldChainAddOns, WorldChainBuilder},
     },
-    pbh::semaphore::{DateMarker, ExternalNullifier, Proof, SemaphoreProof},
+    pbh::semaphore::{Proof, SemaphoreProof},
     pool::{
         ordering::WorldChainOrdering,
         root::{LATEST_ROOT_SLOT, OP_WORLD_ID},

world-chain-builder/src/external_nullifier.rs

@@ -85,7 +85,6 @@ impl FromStr for ExternalNullifier {
 
 #[cfg(test)]
 mod tests {
-    use semaphore::hash_to_field;
     use test_case::test_case;
 
     use super::*;

world-chain-builder/src/pool/validator.rs

@@ -293,7 +293,6 @@ pub mod tests {
     use tempfile::tempdir;
     use test_case::test_case;
 
-    use super::*;
     use crate::date_marker::DateMarker;
     use crate::external_nullifier::ExternalNullifier;
     use crate::pbh::db::load_world_chain_db;