Fixes #36849 - Run GHA on Ruby 3.0 #402

Job	Run time
Setup matrix	3s
Rubocop	1m 9s
test:units - Ruby 2.7 and Node 14 on PostgreSQL 12	9m 42s
test:functionals - Ruby 2.7 and Node 14 on PostgreSQL 12	7m 21s
test:graphql - Ruby 2.7 and Node 14 on PostgreSQL 12	2m 2s
webpack:compile test:integration - Ruby 2.7 and Node 14 on PostgreSQL 12	9m 19s
db:seed - Ruby 2.7 and Node 14 on PostgreSQL 12	1m 45s
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	1m 59s
test:units - Ruby 3.0 and Node 14 on PostgreSQL 12	10m 23s
test:functionals - Ruby 3.0 and Node 14 on PostgreSQL 12	6m 38s
test:graphql - Ruby 3.0 and Node 14 on PostgreSQL 12	1m 52s
webpack:compile test:integration - Ruby 3.0 and Node 14 on PostgreSQL 12	10m 28s
db:seed - Ruby 3.0 and Node 14 on PostgreSQL 12	1m 21s
assets:precompile RAILS_ENV=production DATABASE_URL=nulldb://nohost - Ruby 3.0 and Node 14 on PostgreSQL 12	3m 14s
test:external - Ruby 3.0 and Node 14 on PostgreSQL 12	1m 36s
Test suite	1s
	1h 11m 56s

Provide feedback