CI: improve more ci worflow

.github/workflows/nightly.yml

@@ -14,6 +14,10 @@ concurrency:
 jobs:
   build:
     runs-on: macos-26
+    strategy:
+      fail-fast: true
+      matrix:
+        xcode-version: ['26.2']
 
     steps:
       - uses: actions/checkout@v4
@@ -27,7 +31,6 @@ jobs:
       # runtime env setup
       # --------------------------------------------------
       - uses: actions/checkout@v4
-        if: ${{ inputs.is_beta }}
         with:
           repository: 'SideStore/beta-build-num'
           ref: ${{ env.ref }}
@@ -52,6 +55,11 @@ jobs:
           echo "SHORT_COMMIT=$SHORT_COMMIT" >> $GITHUB_ENV
           echo "VERSION=$QUALIFIED_VERSION" >> $GITHUB_ENV
 
+      - name: Setup Xcode
+        uses: maxim-lobanov/setup-xcode@v1.6.0
+        with:
+          xcode-version: ${{ matrix.xcode-version }}
+
       - name: Restore Cache
         id: xcode-cache
         uses: actions/cache/restore@v3