Fix publish.yml

.github/workflows/publish.yml

@@ -47,8 +47,17 @@ jobs:
       - name: dotnet nuget push to NuGet
         run: dotnet nuget push dest\*.nupkg -k ${{secrets.NUGET_API_KEY}} -s https://api.nuget.org/v3/index.json --skip-duplicate
 
+      - name: determine if the tag exists
+      - uses: mukunku/tag-exists-action@v1.0.0
+        id: checkTag
+        with:
+          tag: ${{ steps.getVersion.outputs.first_match }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
       - name: add git tag
         uses: tvdias/github-tagger@v0.0.1
+        if: !${{ steps.checkTag.outputs.exists }}
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
           tag: ${{ steps.getVersion.outputs.first_match }}