feat(bash/bashrc): add `gssh` Bash function
feat(bash/bashrc): add `gssh` Bash function

With the support of the `fzf` command, the `gssh` function helps the
user to ssh into a Google Compute Engine instance effortlessly. If there
are multiple instances, the user can choose his/her desirable instance
of choice from a list of instances.

shoichiaizawa/dotfiles,shoichiaizawa/dotfiles,shoichiaizawa/dotfiles