Add lint and format check GHA workflow (#83)

Author: MarshalX

.github/workflows/lint.yml

@@ -0,0 +1,23 @@
+name: Lint and format check
+
+on: [ pull_request ]
+
+permissions:
+  contents: read
+
+env:
+  RUSTFLAGS: "-Dwarnings"  # treat warnings as errors
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository.
+        uses: actions/checkout@v6
+
+      - name: Run Clippy.
+        run: cargo clippy --all-targets --all-features
+
+      - name: Run fmt check.
+        run: cargo fmt --all -- --check