chore: Use fork to open release-generator pull requests (#967)

Author: dazuma

.github/workflows/release-generators.yml

@@ -15,12 +15,12 @@ jobs:
     steps:
       - name: Checkout repo
         uses: actions/checkout@v3
-      - name: Install Ruby 2.6
+      - name: Install Ruby 3.2
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "2.6"
+          ruby-version: "3.2"
       - name: Install tools
         run: "gem install --no-document toys"
       - name: execute
         run: |
-          toys release generators -v --remote=origin ${{ github.event.inputs.args }}
+          toys release generators -v --fork ${{ github.event.inputs.args }}

.toys/release/generators.rb

@@ -17,15 +17,16 @@
 flag :git_remote, "--remote=NAME" do
   desc "The name of the git remote to use as the pull request head. If omitted, does not open a pull request."
 end
+flag :enable_fork, "--fork" do
+  desc "Use a fork to open the pull request"
+end
 
 include :fileutils
 include :exec, e: true
 include "yoshi-pr-generator"
 
 def run
-  Dir.chdir context_directory
-  yoshi_utils.git_ensure_identity
-  git_unshallow
+  setup
   analyze
   branch_name = "release-generators-#{@release_timestamp}"
   message = "release: gapic-generator #{@new_version}"
@@ -46,6 +47,16 @@ def run
   end
 end
 
+def setup
+  Dir.chdir context_directory
+  yoshi_utils.git_ensure_identity
+  git_unshallow
+  if enable_fork
+    set :git_remote, "release-generators-fork" unless git_remote
+    yoshi_utils.gh_ensure_fork remote: git_remote
+  end
+end
+
 def git_unshallow
   if capture(["git", "rev-parse", "--is-shallow-repository"]).strip == "true"
     exec ["git", "fetch", "--unshallow"]