GitHub Actions release automation (#1962)

.github/workflows/release.yml

@@ -0,0 +1,40 @@
+on:
+  push:
+    tags:
+    - 'v*' # "v1.2.3"
+
+name: Upload Release Asset
+
+jobs:
+  build:
+    name: Upload Release Asset
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Build project
+        id: build_linux
+        run: |
+          make dist
+          cd dist
+          echo "::set-output name=linux_amd64_archive::"$(echo nimbus-eth2_Linux_amd64_*.tar.gz)
+      - name: Create Release
+        id: create_release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: Release ${{ github.ref }}
+          draft: true
+          prerelease: false
+      - name: Upload Release Asset
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ./dist/${{ steps.build_linux.outputs.linux_amd64_archive }}
+          asset_name: ${{ steps.build_linux.outputs.linux_amd64_archive }}
+          asset_content_type: application/gzip
+