Clone to spm using fastlane (#3926)

This moves the logic for cloning the repo out of the CircleCI .yml file
to a new fastlane lane.

Companion PR:
RevenueCat/fastlane-plugin-revenuecat_internal#65

.circleci/config.yml

@@ -1152,21 +1152,16 @@ jobs:
 
   deploy-to-spm:
     docker:
-      - image: cimg/base:stable
-    resource_class: small
+      - image: cimg/ruby:3.1.2
+    working_directory: ~/purchases-ios
+    shell: /bin/bash --login -o pipefail
     steps:
       - checkout
-      - setup-git-credentials
+      - install-rubydocker-dependencies
       - run:
           name: Clone purchases-ios and push to purchases-ios-spm
-          command: |
-            git clone https://github.com/RevenueCat/purchases-ios.git
-            cd purchases-ios
-            git fetch --tags
-            git remote set-url origin https://github.com/RevenueCat/purchases-ios-spm.git
-            git push origin
-            git push --tags
-
+          command: bundle exec fastlane deploy_to_spm
+
 workflows:
   version: 2
   generate-snapshot:

fastlane/Fastfile

@@ -876,6 +876,16 @@ platform :ios do
     update_snapshots_commit(new_hash)
   end
 
+  lane :deploy_to_spm do
+    source_repo = ENV["CIRCLE_REPOSITORY_URL"] || "https://github.com/revenuecat/#{repo_name}"
+    destination_repo = source_repo.sub(/\.git\z/, "-spm.git")
+
+    git_clone_and_push(
+      source_repo: source_repo,
+      destination_repo: destination_repo
+    )
+  end
+
   desc "Create or delete sandbox testers"
   lane :sandbox_testers do
     Spaceship::ConnectAPI.login(use_portal: false)

fastlane/README.md

@@ -354,6 +354,14 @@ Clones or updates snapshots repo
 
 Updates purchases-ios-snapshots-commit to point to latest commit on main
 
+### ios deploy_to_spm
+
+```sh
+[bundle exec] fastlane ios deploy_to_spm
+```
+
+
+
 ### ios sandbox_testers
 
 ```sh