fix: additional_repos: replace pushd, popd with cd

Improve script compatibility

Author: CodeChenL

src/share/rsdk/build/mod/additional_repos.libjsonnet

@@ -24,10 +24,10 @@ function(suite, radxa_mirror, radxa_repo_suffix, product, temp_dir, install_vsco
                 set -e
                 mkdir -p "$1/srv/"
                 cp -R "%(temp_dir)s/debs/." "$1/srv/local-apt-repository"
-                pushd "$1/srv/local-apt-repository"
+                cd "$1/srv/local-apt-repository"
                 apt-ftparchive packages . > ./Packages
                 apt-ftparchive -o "APT::FTPArchive::Release::Origin=local-apt-repository" release . > ./Release
-                popd
+                cd -
                 echo "deb [trusted=yes] file://$1/srv/local-apt-repository ./" > "$1/etc/apt/sources.list.d/99-local-apt-repository.list"
                 cat << EOF > "$1/etc/apt/preferences.d/local-apt-repository"
                 Package: *