Update GitHub actions for packages publishing

This update changes the trigger for the package publishing action to only 'published' releases and prereleases. It also segregates the publishing mechanism into two separate actions: one for publishing preview packages to nuget.org, and another for publishing release packages. This change provides better clarity and control over the publishing process.

.github/workflows/packages.yml

@@ -7,7 +7,7 @@ on:
     tags:
       - hotfix-* # e.g. 3.0.0-hotfix-1
   release:
-    types: [ prereleased, released ]
+    types: [ prereleased, published ]
 env:
   feedz_feed_source: 'https://f.feedz.io/elsa-workflows/elsa-3/nuget/index.json'
   nuget_feed_source: 'https://api.nuget.org/v3/index.json'
@@ -62,11 +62,26 @@ jobs:
         run: dotnet nuget push *.nupkg -k ${{ secrets.FEEDZ_API_KEY }} -s ${{ env.feedz_feed_source }} --skip-duplicate
 
   publish_preview_nuget:
-    name: Publish to nuget.org
+    name: Publish preview to nuget.org
     needs: build
     runs-on: ubuntu-latest
     timeout-minutes: 10
-    if: ${{ github.event_name == 'release' || github.event_name == 'prereleased' }}
+    if: ${{ github.event_name == 'prereleased' && github.event.action == 'published' }}
+    steps:
+      - name: Download Packages
+        uses: actions/download-artifact@v3
+        with:
+          name: elsa-nuget-packages
+
+      - name: Publish to nuget.org
+        run: dotnet nuget push *.nupkg -k ${{ secrets.NUGET_API_KEY }} -s ${{ env.nuget_feed_source }} --skip-duplicate
+
+  publish_nuget:
+    name: Publish release to nuget.org
+    needs: build
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    if: ${{ github.event_name == 'release' && github.event.action == 'published' }}
     steps:
       - name: Download Packages
         uses: actions/download-artifact@v3