Add CI builds with artifacts for PRs and main

.github/workflows/build.yml

@@ -0,0 +1,36 @@
+name: Build
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: "1.16.3"
+
+      - name: Install dependencies
+        run: |
+          go version
+          go install golang.org/x/lint/golint@latest
+          sudo apt update
+          sudo apt install -y make
+
+      - name: Run lint
+        run: make build
+
+      - uses: actions/upload-artifact@v2
+        with:
+          name: headscale-linux
+          path: headscale