Fix iOS CI build on macos-26/Xcode 26 runner (#483)

* Fix iOS CI: use writable temp dir for DataStorePreferenceStore tests

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Run iOS workflow on this branch's pushes to test the CI fix

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Remove temporary feature-branch push trigger from iOS workflow

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Filter iOS/Android PR workflows to relevant changed paths

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Revert "Filter iOS/Android PR workflows to relevant changed paths"

This reverts commit f32c120fa8c32f4d56e83603af0e5745d397a7b0.

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Fix iOS build: use StocksWidget scheme in xcodebuild

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Build iOS app against simulator SDK instead of unavailable simulator destination

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Build iOS app for generic device SDK (no simulator runtime on runner)

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Install iOS platform before building app in CI

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Pin named iPhone 17 simulator destination for iOS app build

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

* Condense iOS CI step comments

Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: premnirmal <1255689+premnirmal@users.noreply.github.com>

.github/workflows/ios.yml

@@ -7,9 +7,6 @@ on:
   push:
     branches:
       - 'master'
-      # TEMPORARY: exercise the iOS pipeline on this feature branch before it
-      # is merged to master. Remove this line once the branch is merged.
-      - 'copilot/implement-phase-6'
 
 jobs:
   ios:
@@ -72,10 +69,18 @@ jobs:
         run: |
           source ./version.sh
           xcodegen generate
+      - name: Install iOS platform
+        # The macos-26 image ships the iOS 26 SDK but not the iOS 26 platform
+        # support (simulator runtime), so xcodebuild destinations fail with
+        # "iOS 26.0 is not installed" until it is downloaded on demand.
+        run: sudo xcodebuild -downloadPlatform iOS
       - name: Build iOS app (simulator, no code signing)
+        # Pin a concrete named simulator device: on the arm64 runner it resolves
+        # to a single architecture (a generic destination did not). No OS is
+        # pinned, so an already-installed iPhone 17 runtime is used.
         run: |
           xcodebuild build \
             -project iosApp/StockTicker.xcodeproj \
-            -scheme iosApp \
-            -destination 'generic/platform=iOS Simulator' \
+            -scheme StocksWidget \
+            -destination 'platform=iOS Simulator,name=iPhone 17' \
             CODE_SIGNING_ALLOWED=NO

shared/src/commonTest/kotlin/com/github/premnirmal/ticker/settings/DataStorePreferenceStoreTest.kt

@@ -1,5 +1,6 @@
 package com.github.premnirmal.ticker.settings
 
+import okio.FileSystem
 import kotlin.test.Test
 import kotlin.test.assertEquals
 import kotlin.test.assertNull
@@ -8,7 +9,11 @@ import kotlin.test.assertTrue
 class DataStorePreferenceStoreTest {
 
     private fun newStore(): PreferenceStore {
-        val path = "build/test-datastore/prefs-${kotlin.random.Random.nextInt()}.preferences_pb"
+        // Use an absolute path under the system temporary directory. A relative path is not
+        // writable from the iOS simulator's working directory and makes DataStore throw.
+        val dir = FileSystem.SYSTEM_TEMPORARY_DIRECTORY / "stockticker-test-datastore"
+        FileSystem.SYSTEM.createDirectories(dir)
+        val path = (dir / "prefs-${kotlin.random.Random.nextInt()}.preferences_pb").toString()
         return DataStorePreferenceStore(createPreferenceDataStore { path })
     }