Automatically upload binaries when tagged (ntop#871)

* Add a workflow to automatically upload packages in to tagged releases

* Mark automatic release as a pre-release as that way its contents are actually visible

* Dont run the release job unless we are acting on a tag

* Minor rename to try and fit description into github graph view

.github/workflows/tests.yml

@@ -408,3 +408,28 @@ jobs:
         with:
           name: binaries
           path: binaries
+
+  upload_release:
+    name: Upload Release Assets
+    if: startsWith(github.ref, 'refs/tags/')
+    needs:
+      - package_dpkg
+      - package_rpm
+      - binaries_windows
+      - binaries_macos
+      - binaries_linux_crosscompile
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Fetch all Artifacts
+        uses: actions/download-artifact@v2
+        with:
+          path: artifacts
+
+      - name: Upload Assets to Release
+        uses: softprops/action-gh-release@v1
+        with:
+          prerelease: true
+          files: |
+            artifacts/packages-dpkg/*.deb
+            artifacts/packages-rpm/*.rpm