artifactregistry: implement upstream credentials (#9439) (#603)

* implemented remote auth

* add IAM settings to test
[upstream:74854089df7d0ba6c81ef3465c2ee3980a78bd85]

Signed-off-by: Modular Magician <[email protected]>

artifact_registry_repository_remote_custom/backing_file.tf

@@ -0,0 +1,15 @@
+# This file has some scaffolding to make sure that names are unique and that
+# a region and zone are selected when you try to create your Terraform resources.
+
+locals {
+  name_suffix = "${random_pet.suffix.id}"
+}
+
+resource "random_pet" "suffix" {
+  length = 2
+}
+
+provider "google" {
+  region = "us-central1"
+  zone   = "us-central1-c"
+}

artifact_registry_repository_remote_custom/main.tf

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+data "google_project" "project" {}
+
+resource "google_secret_manager_secret" "example-custom-remote-secret-${local.name_suffix}" {
+  secret_id = "example-secret-${local.name_suffix}"
+  replication {
+    auto {}
+  }
+}
+
+resource "google_secret_manager_secret_version" "example-custom-remote-secret-${local.name_suffix}_version" {
+  secret = google_secret_manager_secret.example-custom-remote-secret-${local.name_suffix}.id
+  secret_data = "remote-password-${local.name_suffix}"
+}
+
+resource "google_secret_manager_secret_iam_member" "secret-access" {
+  secret_id = google_secret_manager_secret.example-custom-remote-secret-${local.name_suffix}.id
+  role      = "roles/secretmanager.secretAccessor"
+  member    = "serviceAccount:service-${data.google_project.project.number}@gcp-sa-artifactregistry.iam.gserviceaccount.com"
+}
+
+resource "google_artifact_registry_repository" "my-repo" {
+  location      = "us-central1"
+  repository_id = "example-custom-remote-${local.name_suffix}"
+  description   = "example remote docker repository with credentials-${local.name_suffix}"
+  format        = "DOCKER"
+  mode          = "REMOTE_REPOSITORY"
+  remote_repository_config {
+    description = "docker hub with custom credentials"
+    docker_repository {
+      public_repository = "DOCKER_HUB"
+    }
+    upstream_credentials {
+      username_password_credentials {
+        username = "remote-username-${local.name_suffix}"
+        password_secret_version = google_secret_manager_secret_version.example-custom-remote-secret-${local.name_suffix}_version.name
+      }
+    }
+  }
+}

artifact_registry_repository_remote_custom/motd

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+===
+
+These examples use real resources that will be billed to the
+Google Cloud Platform project you use - so make sure that you
+run "terraform destroy" before quitting!
+
+===

artifact_registry_repository_remote_custom/tutorial.md

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+# Artifact Registry Repository Remote Custom - Terraform
+
+## Setup
+
+<walkthrough-author name="[email protected]" analyticsId="UA-125550242-1" tutorialName="artifact_registry_repository_remote_custom" repositoryUrl="https://github.com/terraform-google-modules/docs-examples"></walkthrough-author>
+
+Welcome to Terraform in Google Cloud Shell! We need you to let us know what project you'd like to use with Terraform.
+
+<walkthrough-project-billing-setup></walkthrough-project-billing-setup>
+
+Terraform provisions real GCP resources, so anything you create in this session will be billed against this project.
+
+## Terraforming!
+
+Let's use {{project-id}} with Terraform! Click the Cloud Shell icon below to copy the command
+to your shell, and then run it from the shell by pressing Enter/Return. Terraform will pick up
+the project name from the environment variable.
+
+```bash
+export GOOGLE_CLOUD_PROJECT={{project-id}}
+```
+
+After that, let's get Terraform started. Run the following to pull in the providers.
+
+```bash
+terraform init
+```
+
+With the providers downloaded and a project set, you're ready to use Terraform. Go ahead!
+
+```bash
+terraform apply
+```
+
+Terraform will show you what it plans to do, and prompt you to accept. Type "yes" to accept the plan.
+
+```bash
+yes
+```
+
+
+## Post-Apply
+
+### Editing your config
+
+Now you've provisioned your resources in GCP! If you run a "plan", you should see no changes needed.
+
+```bash
+terraform plan
+```
+
+So let's make a change! Try editing a number, or appending a value to the name in the editor. Then,
+run a 'plan' again.
+
+```bash
+terraform plan
+```
+
+Afterwards you can run an apply, which implicitly does a plan and shows you the intended changes
+at the 'yes' prompt.
+
+```bash
+terraform apply
+```
+
+```bash
+yes
+```
+
+## Cleanup
+
+Run the following to remove the resources Terraform provisioned:
+
+```bash
+terraform destroy
+```
+```bash
+yes
+```