Fix devcontainer build failure (#12837) * add post-installation script * set zsh as default terminal and make post-install execution on postcreate * rename file * rename script * Create devcontainers_ci.yml * Update devcontainer.json * Update devcontainers_ci.yml Never push image built here. It's for build testing purpose only. * postCreateCommand update to reflect that the shell script has been renamed. * update devcontainer readme file * trigger workflow only on devcontainer/** changes * prettier refactor