Install libinput on GitHub CI

.github/workflows/integration.yml

@@ -8,9 +8,14 @@ jobs:
         os: [ubuntu-latest, windows-latest, macOS-latest]
         rust: [stable, beta]
     steps:
-    - uses: actions/checkout@master
     - uses: hecrj/setup-rust-action@v1
       with:
         rust-version: ${{ matrix.rust }}
+    - name: Install libinput
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        sudo apt-get -qq update
+        sudo apt-get install -y libudev-dev
+    - uses: actions/checkout@master
     - name: Run tests
       run: cargo test --verbose