ci: add workflow examples with `tenv` and `tofu` #11

Job	Run time
tests (tofu, 10_fail_invalid_resource_type)	20s
tests (tofu, 11_fail_data_source_error)	12s
tests (tofu, 50_pass_one)	22s
tests (tofu, 51_pass_character_limit)	34s
tests (tofu, 52_pass_format_diff)	11s
tests (terraform, 10_fail_invalid_resource_type)	11s
tests (terraform, 11_fail_data_source_error)	10s
tests (terraform, 50_pass_one)	12s
tests (terraform, 51_pass_character_limit)	42s
tests (terraform, 52_pass_format_diff)	26s
	3m 20s

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