fix pkgconfig path

.github/workflows/build-macos.yml

@@ -26,9 +26,16 @@ jobs:
       - name: Install Qt
         uses: jurplel/install-qt-action@v3
         with:
-          version: "6.7.2"
+          version: ${{ env.QT_VERSION }}
           modules: "qtmultimedia qtlocation qtpositioning qtserialport"
 
+      - name: Update pkgconfig path
+        run: |
+          QT_PKGCFG="$HOME/Qt/${{ env.QT_VERSION }}/clang_64/lib/pkgconfig"
+          echo "Computed QT_PKGCFG=${QT_PKGCFG}"
+          echo "PKG_CONFIG_PATH=${QT_PKGCFG}:$PKG_CONFIG_PATH" >> $GITHUB_ENV
+          ls -la "${QT_PKGCFG}" || true
+
       - name: Set up Go
         uses: actions/setup-go@v6
         with: