package.json: Switch to prepublish non-only to allow usage as Git dependency

[ckiee]

npm, pnpm and Yarn all don't run prepublishOnly when preparing a Git dependency[1]

There is no commit history indicating why it was prepublishOnly nor was it ever changed to this from something else.

[1] https://github.com/pnpm/pnpm/blob/337a110dbc4c569d523a1faf58b540be8f857297/exec/prepare-package/src/index.ts#L13

[MacFJA]

The prepublish event is marked as deprecated in the NPM documentation (Since at least version 6

PNPM support the prepublishOnly event

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I will have to take a look at it, but the last time I did a npm publish, the prepublishOnly was triggered

[ckiee]

Oh maybe prepare is more suitable then. The caveat is I was doing pnpm i github:ckiee/svelte-persistent-store#priv-distract-o-window to use a branch with all my PRs aggregated in my project, and it needs to run the rollup build script then since the output isn't committed naturally.