Explicitly select SDKROOT by Xcode

Author: kateinoigakukun

.github/workflows/test.yml

@@ -10,9 +10,9 @@ jobs:
       matrix:
         entry:
           # Ensure that all host can install toolchain, build project, and run tests
-          - { os: macos-10.15,  toolchain: wasm-5.6.0-RELEASE, wasi-backend: Node }
-          - { os: macos-11,     toolchain: wasm-5.6.0-RELEASE, wasi-backend: Node }
-          - { os: macos-12,     toolchain: wasm-5.6.0-RELEASE, wasi-backend: Node }
+          - { os: macos-10.15,  toolchain: wasm-5.6.0-RELEASE, wasi-backend: Node, xcode: Xcode_12.4.app }
+          - { os: macos-11,     toolchain: wasm-5.6.0-RELEASE, wasi-backend: Node, xcode: Xcode_13.2.1.app }
+          - { os: macos-12,     toolchain: wasm-5.6.0-RELEASE, wasi-backend: Node, xcode: Xcode_13.4.1.app }
           - { os: ubuntu-18.04, toolchain: wasm-5.6.0-RELEASE, wasi-backend: Node }
 
           # Ensure that test succeeds with all toolchains and wasi backend combinations
@@ -33,6 +33,9 @@ jobs:
         uses: actions/checkout@master
         with:
           fetch-depth: 1
+      - name: Select SDKROOT
+        if: ${{ matrix.entry.xcode }}
+        run: sudo xcode-select -s /Applications/${{ matrix.entry.xcode }}
       - uses: swiftwasm/setup-swiftwasm@v1
         with:
           swift-version: ${{ matrix.entry.toolchain }}