Move tests and automation from CircleCI to Github Actions parallel/ma… #29

Job	Run time
set_sites	1m 5s
test_new_site	12m 11s
test_phpunit	2m 5s
test_existing_site (buddhiststudies)	6m 38s
test_existing_site (francestanford)	5m 50s
test_existing_site (hs_design)	6m 6s
test_existing_site (humanitiescore)	5m 8s
test_existing_site (insidehs)	5m 2s
test_existing_site (mcs)	5m 34s
test_existing_site (psychology)	8m 0s
test_existing_site (swshumsci_sandbox)	5m 5s
test_existing_site (womensleadership)	6m 1s
test_existing_site (womensleadershipcp)	5m 4s
deploy_branch	1m 25s
	1h 15m 14s

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