Support OpenTofu early initialisation variables #731

Job	Run time
specific required_version	24s
required_version range	23s
tfswitch	21s
TERRAFORM_VERSION range	22s
tfenv	26s
TFC Workspace	48s
Partial TFC Cloud Configuration	48s
Local State file	27s
TFC Cloud Configuration	56s
tofuenv	24s
required_version with a v prefix	22s
asdf	20s
OPENTOFU_VERSION pre-release with tofu action	27s
Prefer OpenTofu, but only Terraform matches constraints	25s
Get version constraint from hard to parse file	21s
provider versions	34s
OPENTOFU_VERSION with terraform action	32s
Partial TFC Cloud Configuration with tags	1m 5s
Remote State file	2m 52s
Version detection on arm	2m 10s
latest	24s
OPENTOFU_VERSION with tofu action	18s
	15m 9s

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