workflows: bump docker/setup-buildx-action from 2 to 3 #1148

	# For skipped checks that are required to merge we trigger a fake job that succeeds.
	# https://docs.github.com/en/repositories/configuring-branches-and-merges-in-your-repository/defining-the-mergeability-of-pull-requests/troubleshooting-required-status-checks#handling-skipped-but-required-checks
	name: Run unit tests
	on:
	pull_request:
	paths:
	- '.github/**'
	- 'dockerfiles/**'
	- 'docker_compose/**'
	- 'packaging/**'
	- '.gitignore'
	- 'appveyor.yml'
	- '**.sh'
	- 'examples/**'

	jobs:
	run-all-unit-tests:
	runs-on: ubuntu-latest
	name: Unit tests (matrix)
	steps:
	- run: echo "No unit tests required"

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