ci: add workflow examples with `tenv` and `tofu` #4

Job	Run time
tests (tofu, 10_fail_invalid_resource_type)	9s
tests (tofu, 11_fail_data_source_error)	16s
tests (tofu, 50_pass_one)	7s
tests (tofu, 51_pass_character_limit)	9s
tests (tofu, 52_pass_format_diff)	14s
tests (terraform, 10_fail_invalid_resource_type)	9s
tests (terraform, 11_fail_data_source_error)	7s
tests (terraform, 50_pass_one)	7s
tests (terraform, 51_pass_character_limit)	9s
tests (terraform, 52_pass_format_diff)	13s
	1m 40s

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