Set DEVELOPER_DIR

Author: shahmishal

.github/workflows/swift_package_test.yml

@@ -119,7 +119,8 @@ jobs:
             do
               printf "%s\n" $i >> $GITHUB_ENV
             done
-            echo "DEVELOPER_DIR=/Applications/Xcode_${{ matrix.xcode_version }}.app" >> $GITHUB_ENV
+      - name: Select Xcode
+        run: echo "DEVELOPER_DIR=/Applications/Xcode_${{ matrix.xcode_version }}.app" >> $GITHUB_ENV
       - name: Swift version
         run: xcrun swift --version
       - name: Pre-build