Add clippy and rustfmt check workflow

.github/workflows/check.yml

@@ -0,0 +1,29 @@
+on: [push, pull_request]
+name: Run checks
+
+env:
+  RUSTFLAGS: "-Dwarnings"
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install packages
+        run: sudo apt-get update && sudo apt-get install libgtk-3-dev gcc-mingw-w64
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: nightly
+          components: clippy, rustfmt
+          target: x86_64-pc-windows-gnu
+          override: true
+
+      - uses: actions-rs/clippy-check@v1
+        name: Check clippy
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all-features --all-targets -- -D warnings
+
+      - name: Check rustfmt
+        run: cargo fmt -- --check