add a comment with repository_file optimization

terraform/data.tf

@@ -28,6 +28,31 @@ data "github_repository" "this" {
 # @resources.team_membership.data
 data "github_organization_teams" "this" {}
 
+# once https://github.com/integrations/terraform-provider-github/issues/1131 is resolved
+# we can replace data.github_branch.this and data.github_tree.this with the following:
+# data "github_repository_file" "this" {
+#   for_each = merge([
+#     for repository, files in lookup(local.github, "repository_file", {}) :
+#     {
+#       for file, config in {
+#         for file, config in files :
+#         file => merge({
+#           branch = lookup(config, "branch", data.github_repository.this[repository].default_branch)
+#         }, config) if contains(keys(data.github_repository.this), repository)
+#       } :
+#       "${repository}/${file}:${config.branch}" => {
+#         repository = repository
+#         file       = file
+#         branch     = config.branch
+#       }
+#     }
+#   ]...)
+#
+#   repository = each.value.repository
+#   file       = each.value.file
+#   branch     = each.value.branch
+# }
+
 data "github_branch" "this" {
   for_each = merge([
     for repository, files in lookup(local.github, "repository_file", {}) :
@@ -55,5 +80,5 @@ data "github_tree" "this" {
 
   recursive  = true
   repository = each.value.repository
-  tree_sha   = data.value.sha
+  tree_sha   = each.value.sha
 }