TestFlight only release and promotion (#3474)

<!--
Note: This checklist is a reminder of our shared engineering
expectations. Feel free to change it, although assigning a GitHub
reviewer and the items in bold are required.

⚠️ If you're an external contributor, please file an issue first before
working on a PR, as we can't guarantee that we will accept your changes
if they haven't been discussed ahead of time. Thanks!
-->

Task/Issue URL: https://app.asana.com/0/0/1208234424227124/f
Tech Design URL:
CC:  @ayoy 

**Description**:
- Changes nightly builds to release to TestFlight only
- Adds promote TestFlight to appstore (mirroring MacOS) which gets the
latest test flight build and uploads the meta data for that version.
Currently only tested with Alpha.

<!--
If at any point it isn't actively being worked on/ready for
review/otherwise moving forward strongly consider closing it (or not
opening it in the first place). If you decide not to close it, use Draft
PR while work is still in progress or use `DO NOT MERGE` label to
clarify the PRs state and comment with more information.
-->

**Steps to test this PR**:
- [Initial test
flow](https://github.com/duckduckgo/iOS/actions/runs/11491500989/job/31983979375)
(without upload meta data).
- This iteration of the flow only checked the version and build number
to upload without doing the upload
- For Alpha it found `Latest upload for version 7.142.0 on ios platform
is build: 1`
- For Stable it found `Latest upload for version 7.142.0 on ios platform
is build: 0`
- The nightly job ran (conveniently) to update the alpha build in
TestFlight, and a rerun of the [promote
flow](https://github.com/duckduckgo/iOS/actions/runs/11491747964/job/31984649252)
showed it found updated build number of 2 which we expect
- [Final
run](https://github.com/duckduckgo/iOS/actions/runs/11492279658) failed
due to Alpha not quite setup to accept submissions due to metadata
conflicts with stable, but it did successfully update the version and
some of the metadata, so confident this will work for stable builds.

Before 

![image](https://github.com/user-attachments/assets/a4e47883-f1bf-4256-9425-a3870a0d9be9)


After promotion run

![image](https://github.com/user-attachments/assets/1d23ea75-e26e-41de-a976-6052068f6b15)



<!--
Before submitting a PR, please ensure you have tested the combinations
you expect the reviewer to test, then delete configurations you *know*
do not need explicit testing.

Using a simulator where a physical device is unavailable is acceptable.
-->

**Definition of Done (Internal Only)**:

* [ ] Does this PR satisfy our [Definition of
Done](https://app.asana.com/0/1202500774821704/1207634633537039/f)?

**Copy Testing**:

* [ ] Use of correct apostrophes in new copy, ie `’` rather than `'`

**Orientation Testing**:

* [ ] Portrait
* [ ] Landscape

**Device Testing**:

* [ ] iPhone SE (1st Gen)
* [ ] iPhone 8
* [ ] iPhone X
* [ ] iPhone 14 Pro
* [ ] iPad

**OS Testing**:

* [ ] iOS 15
* [ ] iOS 16
* [ ] iOS 17

**Theme Testing**:

* [ ] Light theme
* [ ] Dark theme

---
###### Internal references:
[Software Engineering
Expectations](https://app.asana.com/0/59792373528535/199064865822552)
[Technical Design
Template](https://app.asana.com/0/59792373528535/184709971311943)

.github/workflows/promote_testflight.yml

@@ -0,0 +1,33 @@
+name: Promote TestFlight to App Store
+
+on: 
+  workflow_dispatch: {}
+
+jobs:
+  promote-testflight-to-appstore:
+    runs-on: macos-14
+
+    steps:
+    - name: Check out the code
+      uses: actions/checkout@v4
+      with:
+        ref: ${{ github.ref_name }}
+        sparse-checkout: |
+          .github
+          Gemfile
+          Gemfile.lock
+          fastlane
+          scripts
+
+    - name: Set up fastlane
+      run: bundle install
+
+    - name: Promote TestFlight to App Store
+      env:
+        APPLE_API_KEY_BASE64: ${{ secrets.APPLE_API_KEY_BASE64 }}
+        APPLE_API_KEY_ID: ${{ secrets.APPLE_API_KEY_ID }}
+        APPLE_API_KEY_ISSUER: ${{ secrets.APPLE_API_KEY_ISSUER }}
+      run: |
+        git config --global user.name "Dax the Duck"
+        git config --global user.email "[email protected]"
+        bundle exec fastlane promote_latest_testflight_to_appstore

.github/workflows/release.yml

@@ -6,7 +6,7 @@ on:
       destination:
         description: "Upload destination (App Store or TestFlight)"
         required: true
-        default: appstore
+        default: testflight
         type: choice
         options:
         - appstore
@@ -36,10 +36,9 @@ jobs:
       id: destination
       run: |
         INPUT_DESTINATION=${{ github.event.inputs.destination }}
-        echo "destination=${INPUT_DESTINATION:-"appstore"}" >> $GITHUB_OUTPUT
+        echo "destination=${INPUT_DESTINATION:-"testflight"}" >> $GITHUB_OUTPUT
 
     - name: Assert release branch
-      if: steps.destination.outputs.destination == 'appstore'
       run: |
         case "${{ github.ref }}" in
           *release/*) ;;

fastlane/Fastfile

@@ -168,6 +168,32 @@ lane :alpha_adhoc do |options|
   end
 end
 
+
+
+desc 'Promotes the latest TestFlight build to App Store without submitting for review'
+lane :promote_latest_testflight_to_appstore do |options|
+
+  app_identifier = options[:alpha] ? "com.duckduckgo.mobile.ios.alpha" : "com.duckduckgo.mobile.ios"
+
+  latest_testflight_build_number(
+    api_key: get_api_key,
+    username: get_username(options),
+    platform: 'ios',
+    app_identifier: app_identifier
+  )
+
+  latest_build_number = lane_context[SharedValues::LATEST_TESTFLIGHT_BUILD_NUMBER]   
+  latest_build_version = lane_context[SharedValues::LATEST_TESTFLIGHT_VERSION]
+
+  UI.message("The latest build number #{latest_build_number} of the latest version: #{latest_build_version} for app identifier: #{app_identifier}")
+
+  upload_metadata({
+    build_number: latest_build_number.to_s,
+    app_version: latest_build_version.to_s,
+    app_identifier: app_identifier 
+  })
+end
+
 desc 'Makes App Store release build and uploads it to App Store Connect'
 lane :release_appstore do |options|
   build_release(options)
@@ -194,7 +220,8 @@ desc 'Updates App Store metadata'
 lane :upload_metadata do |options|
   deliver(common_deliver_arguments.merge(options).merge({
     skip_binary_upload: true,
-    skip_metadata: false
+    skip_metadata: false,
+    version_check_wait_retry_limit: 0
   }))
 end