Issue #354: Add taint and untaint command

[duckpuppy]

The TerraformTaintPlugin adds new parameters to a build for resources to taint / untaint. If nothing is specified, then the plugin does nothing. If a value is provided in one of the parameters, then the corresponding command will be ran prior to the terraform plan command. It also includes support for restricting the execution to a given branch or set of branches, as well as restricting based the origin repository of the code checked out in the workspace.

// Jenkinsfile
@Library(['terraform-pipeline@v3.10']) _

Jenkinsfile.init(this, env)

// This enables the "taint" and "untaint" functionality
// It will only apply to the master branch (default behavior)
// and will only apply if the current worspace code is checked out from the
// MyOrg/myrepo repository.
TerraformTaintPlugin.init()
TerraformTaintPlugin.onlyOnOriginRepo("MyOrg/myrepo")

def validate = new TerraformValidateStage()

def destroyQa = new TerraformEnvironmentStage('qa')
def destroyUat = new TerraformEnvironmentStage('uat')
def destroyProd = new TerraformEnvironmentStage('prod')

validate.then(destroyQa)
        .then(destroyUat)
        .then(destroyProd)
        .build()

Fixes #354

[kmanning]

In the meantime, @duckpuppy, how would you feel about removing the onlyOnOriginRepo() functionality? If it's really needed, it could be purely additive in a fast-follow PR. Otherwise, the discussion in #356 might bring up a better alternative.

[kmanning]

Is environment dead code?

[kmanning]

Gross, it's part of the TerraformCommand interface.

[kmanning]

Cutting a separate issue for that - #357

[duckpuppy]

Yeah, that was part of why I moved environment management into it when I was converting it to a trait - it already had getEnvronment() in the interface.

[kmanning]

Looks good,