ci: add conditional check for pull request in CI workflow #60

Job	Run time
Define Version / define_version	4s
📝 Commitlint / Check Conventional Commits	11s
🔨 Build and test / build_test	4m 50s
📊 Publish Test	0s
📦 NuGet Publish / nuget-publish	0s
📖 Draft Release	0s
	5m 5s

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