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Add GitHub Actions CI workflow alongside CircleCI #15

Job	Run time
javascript-integration-tests	59s
test-docker-build	3m 47s
javascript-tests	50s
python-tests-perf	4m 45s
builds	1m 47s
python-tests-general	7m 32s
python-tests-frontend	4m 2s
javascript-lint	22s
python-tests-telemetry	3m 29s
	27m 33s