rename zsh completion function _earth to _earthly

[alexcb]

• this was missed when we renamed the earth command to earthly

Signed-off-by: Alex Couture-Beil alex@earthly.dev

[alexcb]

In order to get this working on my mac, I ended up reinstalling oh-my-zsh and had to fix some permissions issues with:

wget https://raw.githubusercontent.com/ohmyzsh/ohmyzsh/master/tools/install.sh

# fix security issues
compaudit | xargs chmod g-w,o-w

rm -r /Users/$USER/.oh-my-zsh
ZSH= sh install.sh

brew uninstall earthly
brew install earthly