CI/CD: fix failing xcode-select after policy change in GitHub Actions MacOS runner image

.github/actions/setup-build-environment/action.yml

@@ -3,11 +3,6 @@ description: This action installs all build tools needed for irmamobile and cach
 runs:
   using: composite
   steps:
-    # The macOS runner's default XCode version changes over time, so we need to pin it to a specific version.
-    - name: Select Xcode version
-      if: runner.os == 'macOS'
-      run: ./ci_scripts/select_xcode.sh
-      shell: bash
     - uses: actions/setup-java@v4
       with:
         distribution: temurin

.github/workflows/delivery.yml

@@ -10,7 +10,7 @@ concurrency: ${{ github.ref }}
 
 jobs:
   build-irmagobridge-ios:
-    runs-on: macos-14
+    runs-on: macos-15 # MacOS version is pinned, because it determines which XCode version is used.
     steps:
       - name: Check out repository
         uses: actions/checkout@v4
@@ -35,7 +35,7 @@ jobs:
           path: android/irmagobridge/irmagobridge.aar
   build-app-ios-alpha:
     # Ad Hoc builds do not require unique build numbers, so we can build this on every push.
-    runs-on: macos-14
+    runs-on: macos-15 # MacOS version is pinned, because it determines which XCode version is used.
     needs: build-irmagobridge-ios
     environment: ad-hoc-alpha
     steps:
@@ -164,7 +164,7 @@ jobs:
         shell: bash
         continue-on-error: true
   build-app-ios-beta:
-    runs-on: macos-14
+    runs-on: macos-15 # MacOS version is pinned, because it determines which XCode version is used.
     needs: version-check
     if: needs.version-check.outputs.version-changed == 'true'
     environment: app-store-beta

.github/workflows/status-checks.yml

@@ -34,7 +34,7 @@ jobs:
         uses: ./.github/actions/setup-build-environment
       - run: bundle exec fastlane unit_test
   build-irmagobridge-ios:
-    runs-on: macos-14 # MacOS version is pinned, because it determines which XCode version is used.
+    runs-on: macos-15 # MacOS version is pinned, because it determines which XCode version is used.
     needs: lint
     steps:
       - name: Check out repository
@@ -80,7 +80,7 @@ jobs:
           name: prototypes-alpha-android
           path: ./build/app/outputs/apk/alpha/release/*.apk
   build-app-ios-alpha:
-    runs-on: macos-14 # MacOS version is pinned, because it determines which XCode version is used.
+    runs-on: macos-15 # MacOS version is pinned, because it determines which XCode version is used.
     needs: build-irmagobridge-ios
     steps:
       - name: Check out repository
@@ -152,7 +152,7 @@ jobs:
           name: app-${{ matrix.flavor }}-android-${{ matrix.type }}
           path: ./fastlane/build/*
   build-integration-test-ios:
-    runs-on: macos-14 # MacOS version is pinned, because it determines which XCode version is used.
+    runs-on: macos-15 # MacOS version is pinned, because it determines which XCode version is used.
     needs: build-irmagobridge-ios
     outputs:
       matrix: ${{ steps.set-matrix.outputs.matrix }}
@@ -220,6 +220,7 @@ jobs:
     strategy:
       matrix:
         file_name: ${{ fromJson(needs.build-integration-test-ios.outputs.matrix) }}
+      fail-fast: false # To prevent we have to re-run all tests when one run is flaky.
     concurrency: integration-test-ios-${{ matrix.file_name }} # To prevent that we use too much test resources at the same time.
     steps:
       - name: Download test artifacts