add github build

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

Author: sagikazarmark

.github/workflows/.editorconfig

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+[*.yml]
+indent_size = 2

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:  # Support latest and one minor back
+        go: ['1.15', '1.16']
+    env:
+      GOFLAGS: -mod=readonly
+
+    steps:
+      - name: Set up Go
+        uses: actions/setup-go@v2.1.3
+        with:
+          stable: 'false'
+          go-version: ${{ matrix.go }}
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Run tests
+        run: go test -v -race ./...