Fixes #36849 - Run GHA on Ruby 3.0 (alternative) #226

Job	Run time
Setup matrix	3s
Rubocop	1m 9s
test:units - Ruby 2.7 and Node 14 on PostgreSQL 12	9m 28s
test:functionals - Ruby 2.7 and Node 14 on PostgreSQL 12	6m 36s
test:graphql - Ruby 2.7 and Node 14 on PostgreSQL 12	2m 5s
webpack:compile test:integration - Ruby 2.7 and Node 14 on PostgreSQL 12	9m 22s
db:seed - Ruby 2.7 and Node 14 on PostgreSQL 12	1m 38s
assets:precompile RAILS_ENV=production DATABASE_URL=nulldb://nohost - Ruby 2.7 and Node 14 on PostgreSQL 12	3m 3s
test:external - Ruby 2.7 and Node 14 on PostgreSQL 12	2m 9s
test:units - Ruby 3.0 and Node 14 on PostgreSQL 12	11m 16s
test:functionals - Ruby 3.0 and Node 14 on PostgreSQL 12	8m 3s
test:graphql - Ruby 3.0 and Node 14 on PostgreSQL 12	3m 38s
webpack:compile test:integration - Ruby 3.0 and Node 14 on PostgreSQL 12	10m 58s
db:seed - Ruby 3.0 and Node 14 on PostgreSQL 12	2m 50s
assets:precompile RAILS_ENV=production DATABASE_URL=nulldb://nohost - Ruby 3.0 and Node 14 on PostgreSQL 12	4m 11s
test:external - Ruby 3.0 and Node 14 on PostgreSQL 12	2m 54s
Test suite	0s
	1h 19m 23s

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