Add a module for setting up GitHub repositories

Labels are taken from XenitAB/terraform-modules for now, but can be
tweaked later.

Resolves #446

modules/github/validate-repository-settings/main.tf

@@ -0,0 +1,143 @@
+/**
+  * This module sets up a GitHub repository in a standardized way, to ensure
+  * consistency among things like branch and PR handling, labels and so on.
+  */
+
+terraform {
+  required_version = "0.15.3"
+
+  required_providers {
+    github = {
+      source  = "integrations/github"
+      version = "~> 4.0"
+    }
+  }
+}
+
+provider "github" {
+  owner = "XenitAB"
+  token = var.github_token
+}
+
+resource "github_repository" "this" {
+  name        = var.repository_name
+  description = var.repository_description
+
+  allow_auto_merge       = false
+  allow_merge_commit     = true
+  allow_rebase_merge     = true
+  allow_squash_merge     = true
+  delete_branch_on_merge = true
+  has_downloads          = false
+  has_issues             = true
+  has_wiki               = false
+  visibility             = var.repository_visibility
+}
+
+resource "github_branch_protection" "this" {
+  repository_id  = github_repository.this
+  pattern        = "main"
+  enforce_admins = true
+  required_pull_request_reviews {
+    required_approving_review_count = 1
+  }
+  required_status_checks {
+    contexts = var.required_status_checks
+  }
+}
+
+resource "github_branch_default" "this" {
+  repository = github_repository.this
+  branch     = "main"
+}
+
+resource "github_issue_label" "automation_label" {
+  repository  = github_repository.this
+  name        = "automation"
+  color       = "63DC57"
+  description = "Issue or PR that is created by non-human"
+}
+
+resource "github_issue_label" "backlog_label" {
+  repository  = github_repository.this
+  name        = "backlog"
+  color       = "B099EF"
+  description = "Will be done at a later date"
+}
+
+resource "github_issue_label" "breaking_change_label" {
+  repository  = github_repository.this
+  name        = "breaking change"
+  color       = "B60205"
+  description = "Breaking change"
+}
+
+resource "github_issue_label" "bug_label" {
+  repository  = github_repository.this
+  name        = "bug"
+  color       = "D73A4A"
+  description = "Something isn't working"
+}
+
+resource "github_issue_label" "documentation_label" {
+  repository  = github_repository.this
+  name        = "documentation"
+  color       = "0075CA"
+  description = "Improvements or additions to documentation"
+}
+
+resource "github_issue_label" "duplicate_label" {
+  repository  = github_repository.this
+  name        = "duplicate"
+  color       = "CFD3D7"
+  description = "This issue or pull request already exists"
+}
+
+resource "github_issue_label" "enhancement_label" {
+  repository  = github_repository.this
+  name        = "enhancement"
+  color       = "A2EEEF"
+  description = "This issue or pull request already exists"
+}
+
+resource "github_issue_label" "good_first_issue_label" {
+  repository  = github_repository.this
+  name        = "good first issue"
+  color       = "7057FF"
+  description = "Good for newcomers"
+}
+
+resource "github_issue_label" "help_wanted_label" {
+  repository  = github_repository.this
+  name        = "help wanted"
+  color       = "008672"
+  description = "Extra attention is needed"
+}
+
+resource "github_issue_label" "ignore_changelog_label" {
+  repository  = github_repository.this
+  name        = "ignore changelog"
+  color       = "221BD0"
+  description = "Should not be mentioned in changelog"
+}
+
+resource "github_issue_label" "invalid_label" {
+  repository  = github_repository.this
+  name        = "invalid"
+  color       = "E4E669"
+  description = "This doesn't seem right"
+}
+
+resource "github_issue_label" "question_label" {
+  repository  = github_repository.this
+  name        = "question"
+  color       = "D876E3"
+  description = "Further information is requested"
+}
+
+resource "github_issue_label" "wontfix_label" {
+  repository  = github_repository.this
+  name        = "wontfix"
+  color       = "FFFFFF"
+  description = "This will not be worked on"
+}

modules/github/validate-repository-settings/variables.tf

@@ -0,0 +1,27 @@
+variable "repository_name" {
+  description = "Name of the repository"
+  type        = string
+}
+
+variable "repository_description" {
+  description = "Description for this repository"
+  type        = string
+  default     = "No description"
+}
+
+variable "repository_visibility" {
+  description = "The visibility of the repository"
+  type        = string
+  default     = "private"
+}
+
+variable "github_token" {
+  description = "Token used to access GitHub"
+  type        = string
+  sensitive   = true
+}
+
+variable "required_status_checks" {
+  type    = list(string)
+  default = ["test"]
+}