Repository navigation

Add GitHub Actions CI workflow alongside CircleCI #6

Job	Run time
javascript-tests	51s
python-tests-frontend	4m 42s
test-docker-build	3m 3s
python-tests-perf	5m 36s
javascript-integration-tests	1m 1s
python-tests-telemetry	3m 24s
builds	1m 39s
javascript-lint	25s
python-tests-general	4m 56s
	25m 37s