fastlane: rebase main with develop after a release

moved the git fetch into the setup of xcode cloud

fix

ci_scripts/ci_common.sh

@@ -27,6 +27,8 @@ setup_xcode_cloud_environment () {
 
     bundle config path vendor/bundle
     bundle install --jobs 4 --retry 3
+    # Xcode Cloud shallow clones the repo. We need to deepen it to fetch tags, commit history and be able to rebase main on develop at the end of releases.
+    git fetch --unshallow --quiet
 }
 
 install_xcode_cloud_brew_dependencies () {
@@ -56,10 +58,6 @@ generate_what_to_test_notes() {
     if [[ -d "$CI_APP_STORE_SIGNED_APP_PATH" ]]; then
         TESTFLIGHT_DIR_PATH=TestFlight
         TESTFLIGHT_NOTES_FILE_NAME=WhatToTest.en-US.txt
-
-        # Xcode Cloud shallow clones the repo, we need to deepen it to fetch tags and commit history
-        # Instead of trying `--deepen=<depth>` just do a full unshallow to avoid future surprises
-        git fetch --unshallow --quiet
         
         LATEST_TAG=""
         if [ "$CI_WORKFLOW" = "Release" ]; then

fastlane/Fastfile

@@ -280,6 +280,24 @@ lane :prepare_next_release do
   sh("git commit -m 'Prepare next release'")
 
   git_push()
+
+  rebase_main_onto_current_branch()
+end
+
+def rebase_main_onto_current_branch
+  # Capture the current branch name
+  current_branch = sh("git rev-parse --abbrev-ref HEAD").strip
+
+  UI.message("Current branch: #{current_branch}")
+
+  # Switch to main and update it
+  sh("git checkout main")
+  sh("git pull origin main")
+  sh("git rebase #{current_branch}")
+
+  git_push()
+
+  UI.success("Successfully rebased main onto #{current_branch}")
 end
 
 lane :tag_nightly do |options|