Drop netcore 3.1 and test .NET6 and .NET7 #122

	name: .NET Core

	on:
	push:
	branches:
	- master
	pull_request:
	branches:
	- master
	jobs:
	ci:
	runs-on: windows-latest
	strategy:
	matrix:
	dotnet-version: ['6.0', '7.0']
	env:
	NUGET_SOURCE_URL: https://nuget.pkg.github.com/LtiLibrary/index.json
	steps:
	- uses: actions/checkout@v2
	- name: Fetch tags
	run: \|
	git fetch origin +refs/tags/:refs/tags/
	git fetch --prune --unshallow
	- name: Build Reason
	run: "echo ref: ${{github.ref}} event: ${{github.event_name}}"
	- name: Setup .NET Core
	uses: actions/setup-dotnet@v1
	with:
	dotnet-version: ${{ matrix.dotnet-version }}
	source-url: ${{ env.NUGET_SOURCE_URL }}
	env:
	NUGET_AUTH_TOKEN: ${{secrets.GITHUB_TOKEN}}
	- name: Build
	run: dotnet build --configuration Release --framework net${{ matrix.dotnet-version }}
	- name: Test
	run: dotnet test --configuration Release --results-directory artifacts --no-build --framework net${{ matrix.dotnet-version }}
	- name: Package
	if: github.event_name != 'pull_request'
	run: dotnet pack --configuration Release --no-build
	- name: Publish nuget
	if: github.event_name != 'pull_request'
	run: dotnet nuget push src//bin/Release/.nupkg --skip-duplicate
	- name: Publish Release Packages
	if: startsWith(github.ref, 'refs/tags/v')
	run: dotnet nuget push src//bin/Release/.nupkg --source https://api.nuget.org/v3/index.json --api-key ${{ secrets.NUGET_TOKEN }}
	- name: Upload Artifacts
	uses: actions/upload-artifact@v2.3.1
	with:
	name: artifacts
	path: artifacts

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