Updating terraform version

update terraform.ps1

# based on https://github.com/guillermo-musumeci/terraform-update-version/blob/master/update-terraform.ps1
# Adding version so we dont get a beta version!
# download the page of Terraform releases
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
$WebResponse = Invoke-WebRequest "https://releases.hashicorp.com/terraform"

# Version =

$Version = '0.12.28'

$versionLink = $WebResponse.Links | Where OuterText -eq "terraform_$version"

# describe the file to download, for the 32-bits, use “ _windows_386.zip” instead
$tfFile = $versionLink.outerText + "_windows_amd64.zip"

# define the full URL of the file to download from the Terraform web site
$tfURL = "https://releases.hashicorp.com" + $versionLink.href + $tfFile

# search for Terraform in Path environment variable
$tfPath = $env:Path -split ';' | Where-Object {$_ -Match "Terraform"}
if(-not $tfPath){
    $tfPath = Read-Host "Please specify path to Terraform.exe"
}

# define the output file where we will download the .zip file of Terraform
$tfOutFile =  "c:\temp\$tffile" 

# download the .zip file from the Terraform web site
Invoke-WebRequest -Uri $tfURL -OutFile $tfOutFile

# extract the content of the .zip file to the Terraform folder
Expand-Archive -LiteralPath $tfOutFile -DestinationPath $tfPath -Force

# check version of Terraform installed
terraform -v