added github workflow

.github/workflows/release.yml

@@ -0,0 +1,49 @@
+name: Release
+
+on: push
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    env:
+      GOFLAGS: -mod=readonly
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: 1.14.4
+      - name: Install
+        run: |
+          make deps
+          git clone https://github.com/sstephenson/bats.git --branch v0.4.0 --depth 1 "${HOME}/bats"
+          export "PATH=${PATH}:${HOME}/bats/bin"
+      - name: Test
+        run: |
+          make fmt
+          git diff --exit-code ':(exclude)go.sum'
+          make test
+      - name: Build
+        run: |
+          mkdir -p dist
+          export GOOS="linux"
+          export CGO_ENABLED=0
+          for arch in amd64 386 arm arm64; do GOARCH="$arch" go build && file supercronic | grep 'statically linked' && mv supercronic "dist/supercronic-${GOOS}-${arch}"; done
+          pushd dist
+          ls -lah *
+          file *
+          sha1sum *
+          sha256sum *
+          popd
+      - name: Release
+        uses: "softprops/action-gh-release@v1"
+        if: startsWith(github.ref, 'refs/tags/') && endsWith(github.ref, '-plain')
+        with:
+          repo_token: "${{ secrets.GITHUB_TOKEN }}"
+          files: "dist/*"
+