feat: Add fastlane for iOS

ios/fastlane/Appfile

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+app_identifier("im.fluffychat.app") # The bundle identifier of your app
+apple_id("christian.pauly@wtal.de") # Your Apple email address
+
+itc_team_id("122628977") # App Store Connect Team ID
+team_id("4NXF6Z997G") # Developer Portal Team ID
+
+# For more information about the Appfile, see:
+#     https://docs.fastlane.tools/advanced/#appfile

ios/fastlane/Fastfile

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+# This file contains the fastlane.tools configuration
+# You can find the documentation at https://docs.fastlane.tools
+#
+# For a list of all available actions, check out
+#
+#     https://docs.fastlane.tools/actions
+#
+# For a list of all available plugins, check out
+#
+#     https://docs.fastlane.tools/plugins/available-plugins
+#
+
+# Uncomment the line if you want fastlane to automatically update itself
+# update_fastlane
+
+default_platform(:ios)
+
+platform :ios do
+  desc "Push a new beta build to TestFlight"
+  lane :beta do
+    increment_build_number(xcodeproj: "Runner.xcodeproj")
+    build_app(workspace: "Runner.xcworkspace", scheme: "Runner")
+    upload_to_testflight
+  end
+end

ios/fastlane/README.md

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+fastlane documentation
+================
+# Installation
+
+Make sure you have the latest version of the Xcode command line tools installed:
+
+```
+xcode-select --install
+```
+
+Install _fastlane_ using
+```
+[sudo] gem install fastlane -NV
+```
+or alternatively using `brew install fastlane`
+
+# Available Actions
+## iOS
+### ios beta
+```
+fastlane ios beta
+```
+Push a new beta build to TestFlight
+
+----
+
+This README.md is auto-generated and will be re-generated every time [fastlane](https://fastlane.tools) is run.
+More information about fastlane can be found on [fastlane.tools](https://fastlane.tools).
+The documentation of fastlane can be found on [docs.fastlane.tools](https://docs.fastlane.tools).

ios/fastlane/report.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<testsuites>
+  <testsuite name="fastlane.lanes">
+    
+    
+    
+      
+      <testcase classname="fastlane.lanes" name="0: default_platform" time="0.000641">
+        
+      </testcase>
+    
+      
+      <testcase classname="fastlane.lanes" name="1: increment_build_number" time="2.088475">
+        
+      </testcase>
+    
+      
+      <testcase classname="fastlane.lanes" name="2: build_app" time="630.512924">
+        
+      </testcase>
+    
+      
+      <testcase classname="fastlane.lanes" name="3: upload_to_testflight" time="1426.146813">
+        
+      </testcase>
+    
+  </testsuite>
+</testsuites>