fix: reduce sim availability flakes

.github/workflows/messaging.yml

@@ -123,73 +123,43 @@ jobs:
       platforms: '[ "ios", "tvos", "macos --skip-tests", "watchos --skip-tests" ]'
       flags: '[ "--use-static-frameworks" ]'
 
-  messaging-sample-build-test:
-    # Don't run on private repo unless it is a PR.
-    if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
-    env:
-      plist_secret: ${{ secrets.GHASecretsGPGPassphrase1 }}
-    runs-on: macos-15
-    steps:
-    - uses: actions/checkout@v4
-    - uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1
-    - name: Xcode
-      run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
-    - name: Setup Bundler
-      run: scripts/setup_bundler.sh
-    - name: Install Secret GoogleService-Info.plist
-      run: |
-        scripts/decrypt_gha_secret.sh scripts/gha-encrypted/messaging-sample-plist.gpg \
-          FirebaseMessaging/Apps/Shared/GoogleService-Info.plist "$plist_secret"
-    - name: Prereqs
-      run: scripts/install_prereqs.sh MessagingSample iOS
-    - name: Build
-      run: ([ -z $plist_secret ] || scripts/build.sh MessagingSample iOS)
-
-  messaging-swiftui-sample-build-test:
+  sample-build-test:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     env:
       plist_secret: ${{ secrets.GHASecretsGPGPassphrase1 }}
     runs-on: macos-15
+    strategy:
+      matrix:
+        include:
+          - target: MessagingSample
+            platform: iOS
+          - target: SwiftUISample
+            platform: iOS
+          - target: MessagingSampleStandaloneWatchApp
+            platform: watchOS
     steps:
     - uses: actions/checkout@v4
     - uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
-    - name: Install Secret GoogleService-Info.plist
-      run: |
-        scripts/decrypt_gha_secret.sh scripts/gha-encrypted/messaging-sample-plist.gpg \
-          FirebaseMessaging/Apps/Shared/GoogleService-Info.plist "$plist_secret"
-    - name: Prereqs
-      run: scripts/install_prereqs.sh SwiftUISample iOS
     - name: Xcode
       run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
-    - name: Build
-      run: ([ -z $plist_secret ] || scripts/build.sh SwiftUISample iOS)
-
-  messaging-watchos-standalone-sample-build-test:
-    # Don't run on private repo unless it is a PR.
-    if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
-    env:
-      plist_secret: ${{ secrets.GHASecretsGPGPassphrase1 }}
-    runs-on: macos-15
-    steps:
-    - uses: actions/checkout@v4
-    - uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1
-    - name: Setup Bundler
-      run: scripts/setup_bundler.sh
     - name: Install Secret GoogleService-Info.plist
       run: |
         scripts/decrypt_gha_secret.sh scripts/gha-encrypted/messaging-sample-plist.gpg \
           FirebaseMessaging/Apps/Shared/GoogleService-Info.plist "$plist_secret"
     - name: Prereqs
-      run: scripts/install_prereqs.sh MessagingSampleStandaloneWatchApp watchOS
-    - name: Xcode
-      run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
-    - name: Install watchOS simulators in case they are missing.
-      run: sudo xcodebuild -downloadPlatform watchOS
+      run: scripts/install_prereqs.sh ${{ matrix.target }} ${{ matrix.platform }}
+    - name: Install simulators in case they are missing.
+      uses: nick-fields/retry@ce71cc2ab81d554ebbe88c79ab5975992d79ba08 # v3
+      with:
+        timeout_minutes: 15
+        max_attempts: 5
+        retry_wait_seconds: 120
+        command: sudo xcodebuild -downloadPlatform ${{ matrix.platform }}
     - name: Build
-      run: ([ -z $plist_secret ] || scripts/build.sh MessagingSampleStandaloneWatchApp watchOS)
+      run: ([ -z $plist_secret ] || scripts/build.sh ${{ matrix.target }} ${{ matrix.platform }})
     - name: Upload xcodebuild logs
       if: failure()
       uses: actions/upload-artifact@v4