zipIgnore should recurse .gitignore files through the project tree

[tip2663]

https://github.com/reddit/devvit/blob/73bac6c43901e4be2671b390507aff4dfe65ce9b/packages/cli/src/util/getAppSourceZip.ts#L21C1-L21C77

See title.
I have a monorepo and some build files from game engine etc. are gitignored only within a subdirectory.
Seems weird that it doesn't recurse.