Add support for detecting OpenTofu version from .opentofu-version files. #692

Job	Run time
No changes	32s
No changes without comment	25s
Change terraform 11	25s
Change terraform 12	23s
Change terraform 13	26s
Change terraform 14	29s
Change terraform 15	25s
always-new	43s
Full colour plan for diff highlighting	40s
Default path	27s
Error	30s
Error without comment	23s
Error with invalid paths	24s
Change terraform 15.4	24s
Change latest terraform	29s
Change without github comment	21s
Change with shell init commands	22s
Plan using deprecated var and sensitive variable	23s
Plan variables some which are sensitive	23s
Plan single sensitive variable	25s
Plan single variable	25s
Add comment without token	25s
Test plan text on Terraform 1.4	28s
	10m 17s

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