Add iOS-fastlane template for .gitlab-ci.yml

changelogs/unreleased/52877-ios-publishing-blog-post-and-gitlab-ci-yml-template.yml

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+---
+title: Add iOS-fastlane template for .gitlab-ci.yml
+merge_request: 25395
+author:
+type: changed

lib/gitlab/ci/templates/iOS-Fastlane.gitlab-ci.yml

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+# This is a very simple template that mainly relies on FastLane to build and distribute your app.
+# Read more about how to use this template on the blog post https://about.gitlab.com/2019/03/06/ios-publishing-with-gitlab-and-fastlane/
+# You will also need fastlane and signing configuration for this to work, along with a MacOS runner. 
+# These details are provided in the blog post.
+
+# Note that when you're using the shell executor for MacOS builds, the
+# build and tests run as the identity of the runner logged in user, directly on
+# the build host. This is less secure than using container executors, so please
+# take a look at our security implications documentation at 
+# https://docs.gitlab.com/runner/security/#usage-of-shell-executor for additional 
+# detail on what to keep in mind in this scenario.
+
+stages:
+  - build
+
+variables:
+  LC_ALL: "en_US.UTF-8"
+  LANG: "en_US.UTF-8"
+  GIT_STRATEGY: clone
+  
+build:
+  stage: build
+  script:
+    - bundle install
+    - bundle exec fastlane build
+  artifacts:
+    paths:
+    - ./*.ipa