Adds Delete Permissions to Codebuild Role

Needed to clear out artifacts folder.

To be tagged v3.5.6

base/codebuild_splunk_apps/iam.tf

@@ -79,7 +79,8 @@ resource "aws_iam_policy" "codebuild_splunk_apps_policy" {
             "Action": [
                 "s3:PutObject",
                 "s3:GetObject*",
-                "s3:ListBucket"
+                "s3:ListBucket",
+                "s3:DeleteObject"
             ]
         },
         {