Add github job for checking formatting

.github/workflows/rust.yml

@@ -2,27 +2,36 @@ name: Rust
 
 on:
   push:
-    branches: [ master ]
+    branches: [master]
   pull_request:
-    branches: [ master ]
+    branches: [master]
 
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  build_test:
-
+  build-test:
     runs-on: ubuntu-20.04
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Update repos
-      run: sudo apt update
-    - name: Install dependencies
-      run: sudo apt install libgtk-3-dev libvulkan-dev
-    - name: Update pci.ids
-      run: sudo sh -c "curl https://pci-ids.ucw.cz/v2.2/pci.ids > /usr/share/misc/pci.ids"
-    - name: Build
-      run: cargo build
-    - name: Run tests
-      run: cargo test --verbose
+      - uses: actions/checkout@v2
+      - name: Update repos
+        run: sudo apt update
+      - name: Install dependencies
+        run: sudo apt install libgtk-3-dev libvulkan-dev
+      - name: Update pci.ids
+        run: sudo sh -c "curl https://pci-ids.ucw.cz/v2.2/pci.ids > /usr/share/misc/pci.ids"
+      - name: Build
+        run: cargo build
+      - name: Run tests
+        run: cargo test --verbose
+
+  check-format:
+    runs-on: ubuntu-20.04
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: install rustfmt
+        run: rustup component add rustfmt
+      - name: Check formatting
+        run: cargo fmt -- --check