Updates the AUTO_TFVARS_COUNTER to increment in decimal

[cdsre]

As part of issue #415 when you have more than 8 vars files the action fails due to it evaluating numbers as octal. This can be reproduced in simple bash shell.

AUTO_TFVARS_COUNTER="00"

for i in {1..10}
> do
> AUTO_TFVARS_COUNTER=$(printf "%02d\n" "$((AUTO_TFVARS_COUNTER + 1))")
> echo $AUTO_TFVARS_COUNTER
> done
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-bash: 08: value too great for base (error token is "08")

This fix will foce the number to decimal before incrementing it and will support any number of vars files. This again can be tested in bash

AUTO_TFVARS_COUNTER="00"

for i in {1..10}
> do
> AUTO_TFVARS_COUNTER=$(printf "%02d\n" "$((10#${AUTO_TFVARS_COUNTER} + 1))")
> echo $AUTO_TFVARS_COUNTER
> done
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[dflook]

Thanks @cdsre, this commit was included in #417 and released in v2.2.3

[chris-doyle-BR-DGE]

Awesome, I dont seem to be able to close this PR feel free to close it so the repo stays tidy.