Update tar command to exclude unwanted parent directories and "."

.github/workflows/brickOS-bibo_CI.yml

@@ -33,8 +33,9 @@ jobs:
 
     # Before archiving, tar the host installation output to preserve file permission
     # c.f. https://github.com/actions/upload-artifact?tab=readme-ov-file#permission-loss
+    # To avoid including a "." or other unwanted directory, c.f. https://stackoverflow.com/a/39530409
     - name: Tar the host installation snapshot to preserve file permissions
-      run:  tar --verbose --create --file build/install.tar --transform='s,build/destdir/,,'  build/destdir/
+      run:  find build/destdir/ -printf "%P\n" | tar --verbose --create --file build/install.tar --no-recursion --directory=build/destdir/ --files-from=-
 
     - name: Archive the host installation snapshot tar file
       uses: actions/upload-artifact@v4