[git] How do I make Git use the editor of my choice for commits?

Just because I came here looking for a one-time solution (in my case, I usually use vim but this one time I wanted to use VS Code) for a single command and others might want to know as well:

GIT_EDITOR='code -w' git rebase -i …

Here's my git/hub version just for context:

git version 2.24.2 (Apple Git-127)
hub version 2.14.1

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