Add GitHub Actions CI for cargo check, fmt, and clippy

Author: 0x4543

.github/workflows/rust-ci.yml

@@ -0,0 +1,38 @@
+name: Rust CI
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  ci:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+
+      - name: Cache cargo registry
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          restore-keys: ${{ runner.os }}-cargo-
+
+      - name: Cargo check
+        run: cargo check --all-targets
+
+      - name: Cargo fmt (check)
+        run: cargo fmt --all -- --check
+
+      - name: Cargo clippy
+        run: cargo clippy --all-targets -- -D warnings