[skip travis] finalised workflow

.github/workflows/build.yml

@@ -146,6 +146,18 @@ jobs:
         SHA2_UNIX: ${{ needs.build_unix.outputs.sha2_unix }}
         YTDLC_VERSION: ${{ needs.build_unix.outputs.ytdlc_version }}
       run: |
-        echo "$SHA2_WINDOWS youtube-dlc.exe" > SHA2-256SUMS
-        echo "$SHA2_WINDOWS32 youtube-dlc32.exe" > SHA2-256SUMS
-        echo "$SHA2_UNIX youtube-dlc" >> SHA2-256SUMS
+        echo "version:$YTDLC_VERSION" >> SHA2-256SUMS
+        echo "youtube-dlc.exe:$SHA2_WINDOWS" >> SHA2-256SUMS
+        echo "youtube-dlc32.exe:$SHA2_WINDOWS32" >> SHA2-256SUMS
+        echo "youtube-dlc:$SHA2_UNIX" >> SHA2-256SUMS
+
+    - name: Upload 256SUMS file
+      id: upload-sums
+      uses: actions/upload-release-asset@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ needs.build_unix.outputs.upload_url }}
+        asset_path: ./SHA2-256SUMS
+        asset_name: SHA2-256SUMS
+        asset_content_type: text/plain