Use a static lock to access the static Instances dictionary #101

	name: run-tests

	on:
	push:
	branches: master
	pull_request:

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- name: Setup .NET Core 3.1
	uses: actions/setup-dotnet@v1
	with:
	dotnet-version: 3.1.x
	- name: Setup .NET Core 5.0
	uses: actions/setup-dotnet@v1
	with:
	dotnet-version: 5.0.x
	- name: Setup .NET Core 6.0
	uses: actions/setup-dotnet@v1
	with:
	dotnet-version: '6.0.x'
	include-prerelease: true
	- uses: actions/checkout@v1
	# This test constantly passes localy (windows + linux) but fails in the test environment. Don't have the time/ inclination to figure out why this is right now..
	- run: dotnet test -c "Debug" --filter Name!=When_blocking_work_is_executed_on_the_thread_pool_then_thread_pool_delays_are_measured

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