fix(ci): gitlab deletes artifacts between builds

Author: jaredcnance

.gitlab-ci.yml

@@ -9,12 +9,7 @@ build:
  stage: build
  script:
   - 'dotnet pack ./src/JsonApiDotNetCore -c Release -o ./artifacts'
+  - 'mono /bin/NuGet.exe push artifacts/*.nupkg $NUGET_KEY -Source $NUGET_SOURCE'
  only:
    - master
-
-publish:
-  stage: deploy
-  script:
-   - 'mono /bin/NuGet.exe push artifacts/*.nupkg $NUGET_KEY -Source $NUGET_SOURCE'
-  only:
-   - master
+