Add "gcloud auth application-default login"

Signed-off-by: Maël Valais <mael@vls.dev>

Author: maelvls

content/en/docs/contributing/release-process.md

@@ -21,8 +21,7 @@ perform a cert-manager release:
  ```sh
  (cd && GO111MODULE=on go get github.com/cert-manager/release/cmd/cmrel@latest)
  ```
-3. Make sure you are granted these roles on the GCP project
- [cert-manager-release](https://console.cloud.google.com/?project=cert-manager-release):
+3. Make sure you are granted these roles on the GCP project [cert-manager-release](https://console.cloud.google.com/?project=cert-manager-release):
 
  - "Cloud Build Editor" (`roles/cloudbuild.builds.builder`),
  - "Storage Object Viewer" (`roles/storage.objectViewer`), and
@@ -33,8 +32,20 @@ perform a cert-manager release:
  page.
 4. You must have time to complete all the steps in the release process (~1 hour).
 5. Install the [`gcloud`](https://cloud.google.com/sdk/) CLI.
-6. Run [`gcloud auth login`](https://cloud.google.com/sdk/docs/authorizing#running_gcloud_auth_login).
-7. Get a GitHub access token [here](https://github.com/settings/tokens)
+6. [Login](https://cloud.google.com/sdk/docs/authorizing#running_gcloud_auth_login)
+ to `gcloud`:
+
+ ```sh
+ gcloud auth application-default login
+ ```
+
+7. Make sure `gcloud` points to the cert-manager-release project:
+
+ ```sh
+ gcloud config set project cert-manager-release
+ ```
+
+8. Get a GitHub access token [here](https://github.com/settings/tokens)
  with the `public_repo` scope. It is used only by the `release-notes` CLI
  to avoid API rate limiting.
 
@@ -83,13 +94,15 @@ The process for cutting a minor release is as follows:
 
 3. Push it to the `jetstack/cert-manager` repository
 
+ > Note: make sure that the `origin` remote points to the upstream <https://github.com/jetstack/cert-manager.git> with `git remote -v`.
+
+ > Note 2: uou need to be an "admin" of the GitHub project to be able to
+ > push to the release branch.
+
  ```bash
  git push --set-upstream origin
  ```
 
- > ⚠️ You need to be an "admin" of the GitHub project to be able to push
- > to the release branch.
-
 4. [Generate and edit the release notes](#generating-and-editing-the-release-notes)
 
 5. Run `cmrel stage`