Build socketcan driver in CI (#588)

* build socketcan driver in CI

* sudo

* does this work on 20.04?

.github/workflows/build_drivers.yaml

@@ -0,0 +1,20 @@
+name: panda drivers
+on: [push, pull_request]
+
+jobs:
+  build_socketcan:
+    name: socketcan build
+    runs-on: ubuntu-20.04
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install dependencies
+        run: |
+          sudo apt-get install -y dkms gcc linux-headers-$(uname -r) make
+      - name: Build socketcan driver
+        run: |
+          cd drivers/linux
+          make link
+          make all
+          make install
+