Fix: New repos fail to create due to empty repository default branch error

[akuzminsky]

Problem

When creating a new repository via Terraform, the github_branch_default resource fails because the repo is empty (no commits/branches yet):

Error: PATCH https://api.github.com/repos/infrahouse/terraform-aws-percona-server: 422 Validation Failed 
[{Resource:Repository Field:default_branch Code:invalid Message:Cannot update default branch for an empty repository. Please init the repository and push first.}]

  with module.repos["terraform-aws-percona-server"].github_branch_default.main,
  on modules/plain-repo/repos.tf line 45, in resource "github_branch_default" "main":
   45: resource "github_branch_default" "main" {

The github_repository_file resources create files, but the github_branch_default resource runs before the branch actually exists.

Proposed Solution

Create repos from a template repository that already has an initial commit. This ensures:

1. The main branch exists from the start
2. github_branch_default can successfully set the default branch
3. Subsequent github_repository_file resources can commit to the existing branch

Related

• Template repo already exists: terraform-template (module ih_tf_template in repos.tf)
• The plain-repo module would need to use template argument in github_repository resource

Workaround

Currently requires manual intervention: re-run terraform apply after the initial files are pushed.