[CI] Fix macOS CPATH for nightly builds

.github/workflows/nightly.yml

@@ -72,8 +72,9 @@ jobs:
       - name: Download LLVM and setup PATH
         run: |
           brew install llvm
-          echo ::add-path::/usr/local/opt/llvm/bin
-          echo ::set-env name=CPATH::`xcrun --show-sdk-path`/usr/include
+          echo "/usr/local/opt/llvm/bin" >> $GITHUB_PATH
+          TMP_PATH=$(xcrun --show-sdk-path)/user/include
+          echo "CPATH=$TMP_PATH" >> $GITHUB_ENV
       - name: build odin
         run: make release
       - name: Odin run