Fix the PULSAR_DIR not set issue

Author: BewareMyPower

.github/workflows/ci-pr-validation.yaml

@@ -65,10 +65,10 @@ jobs:
 
       - name: Test static libraries
         run: |
+          export PULSAR_DIR=$PWD/pkg/mac/.install
           echo "Build with dynamic library"
           clang++ win-examples/example.cc -o dynamic.out -std=c++11 -arch ${{ matrix.arch }} -I $PULSAR_DIR/include -L $PULSAR_DIR/lib -Wl,-rpath $PULSAR_DIR/lib -lpulsar
           ./dynamic.out
-          export PULSAR_DIR=$PWD/pkg/mac/.install
           echo "Build with static library"
           clang++ win-examples/example.cc -o static.out -std=c++11 -arch ${{ matrix.arch }} -I $PULSAR_DIR/include $PULSAR_DIR/lib/libpulsarwithdeps.a -framework SystemConfiguration -framework CoreFoundation
           ./static.out