support relative gemfile reference when running tests #59

Job	Run time
test (2.5, gemfiles/rails_5_1.gemfile)	3m 13s
test (2.5, gemfiles/rails_5_2.gemfile)	3m 27s
test (2.5, gemfiles/rails_6_0.gemfile)	3m 11s
test (2.5, gemfiles/rails_6_1.gemfile)	3m 54s
test (2.6, gemfiles/rails_5_2.gemfile)	3m 37s
test (2.6, gemfiles/rails_6_0.gemfile)	3m 5s
test (2.6, gemfiles/rails_6_1.gemfile)	3m 8s
test (2.7, gemfiles/rails_5_1.gemfile)	2m 55s
test (2.7, gemfiles/rails_5_2.gemfile)	3m 10s
test (2.7, gemfiles/rails_6_0.gemfile)	3m 2s
test (2.7, gemfiles/rails_6_1.gemfile)	3m 22s
test (2.7, gemfiles/rails_7_0.gemfile)	4m 8s
test (2.7, gemfiles/rails_7_1.gemfile)	3m 15s
test (3.0, gemfiles/rails_6_0.gemfile)	1m 31s
test (3.0, gemfiles/rails_6_1.gemfile)	1m 39s
test (3.0, gemfiles/rails_7_0.gemfile)	1m 37s
test (3.0, gemfiles/rails_7_1.gemfile)	1m 43s
test (3.1, gemfiles/rails_6_0.gemfile)	1m 38s
test (3.1, gemfiles/rails_6_1.gemfile)	1m 43s
test (3.1, gemfiles/rails_7_0.gemfile)	1m 31s
test (3.1, gemfiles/rails_7_1.gemfile)	1m 44s
test (3.1, gemfiles/rails_7_2.gemfile)	1m 45s
test (3.2, gemfiles/rails_6_0.gemfile)	1m 35s
test (3.2, gemfiles/rails_6_1.gemfile)	1m 41s
test (3.2, gemfiles/rails_7_0.gemfile)	1m 35s
test (3.2, gemfiles/rails_7_1.gemfile)	1m 29s
test (3.2, gemfiles/rails_7_2.gemfile)	1m 41s
test (3.3, gemfiles/rails_6_0.gemfile)	1m 46s
test (3.3, gemfiles/rails_6_1.gemfile)	1m 39s
test (3.3, gemfiles/rails_7_0.gemfile)	1m 39s
test (3.3, gemfiles/rails_7_1.gemfile)	1m 42s
test (3.3, gemfiles/rails_7_2.gemfile)	1m 47s
test (head, gemfiles/rails_head.gemfile)	2m 57s
	1h 17m 49s

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