Job for automatic native images uploading (scalameta#1711)

.github/workflows/ci.yml

@@ -6,6 +6,8 @@ on:
     tags:
       - '*'
   pull_request:
+  release:
+    types: [published]
 
 jobs:
   test:
@@ -78,10 +80,20 @@ jobs:
         with:
           name: ${{ matrix.artifact }}
           path: scalafmt
+      - name: Upload release
+        if: github.event_name == 'release'
+        uses: actions/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ github.event.release.upload_url }}
+          asset_path: scalafmt
+          asset_name: ${{ matrix.artifact }}
+          asset_content_type: application/zip
   dockerize:
     needs: [native-image,test]
     runs-on: ubuntu-latest
-    if: startsWith(github.ref, 'refs/tags/v')
+    if: startsWith(github.ref, 'refs/tags/v') && github.event_name != 'release'
     steps:
       - uses: actions/checkout@v2
       - run: git fetch --unshallow