Make possible to use Terraform init -reconfigure

[renanqts]

I didn't find a way or issue here mentioning a way to pass -reconfigure into TF init.

terratest/modules/terraform/options.go

Lines 40 to 71 in 09df87f

	type Options struct {
	TerraformBinary string // Name of the binary that will be used
	TerraformDir string // The path to the folder where the Terraform code is defined.
	// The vars to pass to Terraform commands using the -var option. Note that terraform does not support passing `null`
	// as a variable value through the command line. That is, if you use `map[string]interface{}{"foo": nil}` as `Vars`,
	// this will translate to the string literal `"null"` being assigned to the variable `foo`. However, nulls in
	// lists and maps/objects are supported. E.g., the following var will be set as expected (`{ bar = null }`:
	// map[string]interface{}{
	// "foo": map[string]interface{}{"bar": nil},
	// }
	Vars map[string]interface{}
	VarFiles []string // The var file paths to pass to Terraform commands using -var-file option.
	Targets []string // The target resources to pass to the terraform command with -target
	Lock bool // The lock option to pass to the terraform command with -lock
	LockTimeout string // The lock timeout option to pass to the terraform command with -lock-timeout
	EnvVars map[string]string // Environment variables to set when running Terraform
	BackendConfig map[string]interface{} // The vars to pass to the terraform init command for extra configuration for the backend
	RetryableTerraformErrors map[string]string // If Terraform apply fails with one of these (transient) errors, retry. The keys are a regexp to match against the error and the message is what to display to a user if that error is matched.
	MaxRetries int // Maximum number of times to retry errors matching RetryableTerraformErrors
	TimeBetweenRetries time.Duration // The amount of time to wait between retries
	Upgrade bool // Whether the -upgrade flag of the terraform init command should be set to true or not
	NoColor bool // Whether the -no-color flag will be set for any Terraform command or not
	SshAgent *ssh.SshAgent // Overrides local SSH agent with the given in-process agent
	NoStderr bool // Disable stderr redirection
	OutputMaxLineSize int // The max size of one line in stdout and stderr (in bytes)
	Logger *logger.Logger // Set a non-default logger that should be used. See the logger package for more info.
	Parallelism int // Set the parallelism setting for Terraform
	PlanFilePath string // The path to output a plan file to (for the plan command) or read one from (for the apply command)
	PluginDir string // The path of downloaded plugins to pass to the terraform init command (-plugin-dir)
	}

Terraform reconfigure makes easy to fix issues in the backend

https://www.terraform.io/docs/cli/commands/init.html#backend-initialization

[yorinasub17]

Seems reasonable to add a new option for to configure it! We are a bit buried with other initiatives, so most likely won't get to implement this anytime soon, but happy to review a PR if you are up for it.

[wasfree]

Since terraform v0.15.4 behavior on terraform init has changed. If init now encounters a change to the stored backend configuration, it will always return an error when neither -reconfigure or -migrate-state is supplied. This change was merged in hashicorp/terraform#28718 . PR to add this missing options has been raised see: #923