try to import existing environments

imports.tf

@@ -0,0 +1,14 @@
+data "github_repository_environments" "my_envs" {
+  # https://registry.terraform.io/providers/integrations/github/latest/docs/data-sources/repository_environments
+  for_each   = toset(data.github_repositories.my_topics.names)
+  repository = each.key
+}
+
+import {
+  for_each = tomap({
+    for ext in local.existing_envs : "${ext.repository} - ${ext.env_name}" => ext
+  })
+
+  to = github_repository_environment.environments[each.key]
+  id = each.value.env_id
+}

locals.tf

@@ -26,4 +26,14 @@ locals {
       }
     ]
   ])
+
+  existing_envs = flatten([
+    for repo in data.github_repositories.my_topics.names : [
+      for env in data.github_repository_environments.my_envs[repo].environments : {
+        repository = repo
+        env_name   = env.name
+        env_id     = env.node_id
+      }
+    ]
+  ])
 }

main.tf

@@ -24,21 +24,3 @@ provider "github" {
   owner = var.github_owner
   token = var.github_token
 }
-
-data "github_repositories" "my_topics" {
-  # https://docs.github.com/en/search-github/getting-started-with-searching-on-github/understanding-the-search-syntax
-  query = "user:${var.github_owner} topic:practice"
-}
-
-resource "github_repository_environment" "environments" {
-  # https://developer.hashicorp.com/terraform/language/meta-arguments/for_each
-  # local.repo_environments is a list of objects
-  # so we must project that into a map
-  # where each key is unique
-  for_each = tomap({
-    for env in local.repo_environments : "${env.repository} - ${env.environment}" => env
-  })
-
-  repository  = each.value.repository
-  environment = each.value.environment
-}

resources.tf

@@ -0,0 +1,17 @@
+data "github_repositories" "my_topics" {
+  # https://docs.github.com/en/search-github/getting-started-with-searching-on-github/understanding-the-search-syntax
+  query = "user:${var.github_owner} topic:practice"
+}
+
+resource "github_repository_environment" "environments" {
+  # https://developer.hashicorp.com/terraform/language/meta-arguments/for_each
+  # local.repo_environments is a list of objects
+  # so we must project that into a map
+  # where each key is unique
+  for_each = tomap({
+    for env in local.repo_environments : "${env.repository} - ${env.environment}" => env
+  })
+
+  repository  = each.value.repository
+  environment = each.value.environment
+}