Fixes #10878

Since `set -e` is enabled, when `commit.gpgsign` is not set the
`git config` command would show an error. Given that it is technically
not ignored, the subshell would exit.

With this change, the `commit.gpgsign` setting is properly tested
by doing the fallback test if the command fails, so no exit status
code ends up quiting the subshell.

Co-authored-by: inclusive-coding-bot <inclusive-coding-bot@github.com>

Co-authored-by: Marc Cornellà <hello@mcornella.com>

This change still supports CLI 1, but shows a deprecation warning
on the first run of `opswd`. Support for CLI 1 shall be removed
in the near future.

Closes #10787
Co-authored-by: Marc Cornellà <hello@mcornella.com>

Co-authored-by: Mohan Sha <mohansha@outlook.com>

Fixes #10767

Source: https://github.com/zsh-users/zsh-completions/blob/55d07cc/src/_rails

Closes #9600

BREAKING CHANGE: we've updated the aliases that run `rake` to use
`rails` instead because that's how they are run since Rails v5.
The old `rake` aliases can still be run by using the `rk` prefix
(e.g. the `rake test` alias has been changed from `rt` to `rkt`).

Closes #9601
Closes #9813
Fixes #10696
Co-authored-by: Vsevolod Voloshyn <seva.voloshin@gmail.com>