Improve the initial performance of `.GetUnderlyingType<T>()` method #135

	# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json

	name: Unit Testing

	on:
	workflow_dispatch:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	env:
	BuildConfiguration: Release
	CheckoutDirectory: checkout
	ProjectName: FastEnum.UnitTests

	jobs:
	test:
	runs-on: ubuntu-latest

	strategy:
	matrix:
	Tfm: [net8.0, net9.0]

	steps:
	- name: Setup .NET SDK
	uses: actions/setup-dotnet@v4
	with:
	dotnet-version: 9.0.x

	- name: Display .NET version
	run: dotnet --version

	- name: Checkout
	uses: actions/checkout@v4
	with:
	path: ${{ env.CheckoutDirectory }}
	fetch-depth: 0

	- name: Test
	run: dotnet test --verbosity normal --configuration ${{ env.BuildConfiguration }} --framework ${{ matrix.Tfm }} ./${{ env.CheckoutDirectory }}/src/insights/${{ env.ProjectName }}/${{ env.ProjectName }}.csproj

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