Ensure json var-files have a .json extension #763

Job	Run time
No changes	22s
No changes without comment	20s
Change terraform 12	25s
Change terraform 11	24s
Change terraform 13	26s
Change terraform 14	30s
Plan variables some which are sensitive	24s
Error with invalid paths	23s
Plan single variable	28s
Plan JSON tfvars	22s
Test plan text on Terraform 1.4	27s
Change with shell init commands	20s
Default path	26s
Plan single sensitive variable	24s
Change terraform 15	24s
Test on arm64	51s
Change terraform 15.4	24s
always-new	43s
Full colour plan for diff highlighting	49s
Error without comment	22s
Plan using deprecated var and sensitive variable	22s
Change latest terraform	26s
Change without github comment	22s
Add comment without token	20s
Error	22s
	11m 6s

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