Add preconditions for non-main default branch creation and setting

github_branch.tf

@@ -3,28 +3,42 @@
 #   slug = var.github_codeowners_team
 # }
 
-# not creating main branch because its created by default when repo is created
+# Create non-main default branch if specified
 resource "github_branch" "branch" {
-  count      = var.github_default_branch == "main" ? 0 : 1
   repository = local.github_repo.name
   branch     = var.github_default_branch
+
+  # Only create if not "main" and repository exists
+  lifecycle {
+    precondition {
+      condition     = var.github_default_branch != "main"
+      error_message = "Default branch is 'main', skipping branch creation as it's created by default"
+    }
+  }
+
   depends_on = [
     github_repository.repo
   ]
 }
 
-
-# https://registry.terraform.io/providers/integrations/github/latest/docs/resources/branch_default
+# Set the default branch
 resource "github_branch_default" "default_main_branch" {
-  count      = var.github_default_branch == "main" ? 0 : 1
   repository = local.github_repo.name
   branch     = var.github_default_branch
+
+  # Only set if not "main"
+  lifecycle {
+    precondition {
+      condition     = var.github_default_branch != "main"
+      error_message = "Default branch is already 'main', no need to set default"
+    }
+  }
+
   depends_on = [
     github_branch.branch
   ]
 }
 
-
 data "github_user" "pull_request_bypassers" {
   for_each = toset(var.pull_request_bypassers)
   username = each.value