Introduced build release workflow

.github/workflows/build-release.yml

@@ -0,0 +1,25 @@
+name: Build release asset
+on: 
+  release:
+    types: [published]
+jobs:
+  build:
+    name: Build release asset
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Build
+        id: build
+        uses: woocommerce/woocommerce-build-action@master
+        with:
+          generate-zip: true
+      - name: Upload release asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ github.event.release.upload_url }}
+          asset_path: ${{ steps.build.outputs.zip_path }}
+          asset_name: ${{ github.event.repository.name }}.zip
+          asset_content_type: application/zip