Adding destroy attribute to the apply

src/Cake.Terraform.Tests/TerraformApplyTests.cs

@@ -142,6 +142,22 @@ public void Should_Append_Auto_Approve_When_AutoApprove_Is_True()
                 Assert.Contains("-auto-approve", result.Args);
             }
 
+            [Fact]
+            public void Should_Append_Destroy_When_AutoApprove_Is_True()
+            {
+                var fixture = new Fixture
+                {
+                    Settings = new TerraformApplySettings
+                    {
+                        Destroy = true
+                    }
+                };
+
+                var result = fixture.Run();
+
+                Assert.Contains("-destroy", result.Args);
+            }
+
             [Fact]
             public void Should_set_plan_path()
             {

src/Cake.Terraform/Apply/TerraformApplyRunner.cs

@@ -17,6 +17,11 @@ public void Run(TerraformApplySettings settings)
             var builder = new ProcessArgumentBuilder()
                 .Append("apply");
 
+            if (settings.Destroy)
+            {
+                builder.Append("-destroy");
+            }
+
             // Order of AutoApprove and Plan are important.
             if (settings.AutoApprove)
             {

src/Cake.Terraform/Apply/TerraformApplySettings.cs

@@ -36,5 +36,11 @@ public TerraformApplySettings()
         /// <see>https://www.terraform.io/docs/commands/apply.html#input-true</see>
         /// </summary>
         public bool Input { get; set; }
+
+        /// <summary>
+        /// Does destory
+        /// <see>https://www.terraform.io/docs/commands/destroy.html</see>
+        /// </summary>
+        public bool Destroy { get; set; }
     }
 }