github: Introduce build workflow

Build the project across Ubuntu and macOS.

Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>

.github/workflows/build.yml

@@ -0,0 +1,32 @@
+name: Buildtest
+
+on:
+  pull_request:
+  push:
+
+jobs:
+  build:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ ubuntu-latest, macos-latest ]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Dependencies (Ubuntu)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y libxml2-dev libusb-1.0-0-dev
+
+      - name: Dependencies (macOS)
+        if: runner.os == 'macOS'
+        run: |
+          brew install libxml2
+          brew install libusb
+
+      - name: Build
+        run: make