Add workflows

.github/workflows/build.yml

@@ -0,0 +1,29 @@
+on:
+  push:
+    branches:
+      - master
+  release:
+    types:
+      - created
+jobs:
+  linux:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target_cpu: [x64, x86, arm64, arm]
+    env:
+      EXTRA_FLAGS: 'target_cpu="${{ matrix.target_cpu }}"'
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install dependencies
+        run: apt install ninja-build pkg-config libnss3-dev qemu-user ccache
+      - name: Configure
+        working-directory: src
+        run: ./get-clang.sh
+      - name: Show ccache stats
+        run: ccache -s
+      - name: Build
+        working-directory: src
+        run: ./build.sh
+      - name: Basic tests
+        run: ./tests/basic.sh src/out/Release/naive