Update GitHub Actions workflow to use Xcode 15.4 for iOS build

- Adjust Xcode version selection to point to Xcode 15.4
- Modify project reference in build command to use .xcodeproj extension
- Update comments for clarity on project and scheme names

Author: Sjj1024

.github/workflows/build.yml

@@ -1,7 +1,7 @@
 name: iOS Build (Unsigned IPA)
 
 on:
-  workflow_dispatch: # 手动触发
+  workflow_dispatch:
   push:
     branches:
       - main
@@ -15,13 +15,13 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Select Xcode version
-        run: sudo xcode-select -s /Applications/Xcode_16.3.app
+        run: sudo xcode-select -s /Applications/Xcode_15.4.app # 根据实际 Xcode 版本调整
 
       - name: Build archive
         run: |
           xcodebuild clean archive \
-            -project PakePlus.xcworkspace \ # 如果是.xcodeproj就改成 -project
-            -scheme PakePlus \
+            -project PakePlus.xcodeproj \    # 这里改成你项目的实际 .xcodeproj 名称
+            -scheme PakePlus \               # 这里改成你的 scheme 名称
             -configuration Release \
             -archivePath $PWD/build/PakePlus.xcarchive \
             SKIP_INSTALL=NO \