reworked ci pipeline

.gitlab-ci.yml

@@ -31,11 +31,9 @@ publish:
   script:
     - export VERSION=$(echo $CI_COMMIT_TAG | sed 's/^v//')
     - dotnet pack -c Release -o . /p:Version=$VERSION
-    - for nupkg in *.nupkg; do dotnet nuget push $nupkg -k $NUGET_API_KEY -s https://api.nuget.org/v3/index.json; done
+    - for nupkg in *.nupkg; do dotnet nuget push $nupkg -k ${NUGET_API_KEY} -s https://api.nuget.org/v3/index.json; done
   only:
     - tags
   dependencies:
     - build
     - test
-  variables:
-    NUGET_API_KEY: $NUGET_API_KEY