Don't raise when we can't find a Gemfile #169

Job	Run time
call-workflow-from-shared-config / Type Check	23s
call-workflow-from-shared-config / Run tests: Ruby 3.1	2m 4s
call-workflow-from-shared-config / Linter	25s
call-workflow-from-shared-config / Run tests: Ruby 3.2	34s
call-workflow-from-shared-config / Run tests: Ruby 3.3	41s
call-workflow-from-shared-config / notify_on_failure	0s
	4m 7s

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