Copy configs and run project setup steps when creating worktrees.

post-checkout

#!/bin/sh
## .git/hooks/post-checkout

## only runs when creating new worktrees
if [ "$1" -eq "0000000000000000000000000000000000000000" ]; then
  ## Files to copy
  files=(.env)

  ## Get the main worktree path
  basePath="$(dirname "$(git rev-parse --path-format=absolute --git-common-dir)")"

  ## copy config files
  for file in "${files[@]}"; do
    cp "$basePath/$file" "$(pwd)/$file"
  done

  ## run setup commands
  # git submodule update
  # bundle install
  # ...
fi