chore: fail CI if 'pnpm run build:examples' fails

[pippinmole]

Details

This PR makes sure the CI fails if a package fails to build. Currently, we are seeing examples fail to build, but the CI passes anyway 👎

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[pippinmole]

@louisgv I think the issue lies with how @plasmohq/parcel-core handles the bundling. If one of the examples errors while building (and emits a non-zero error code), Parcel needs to propagate this up once again.

It shouldn't log 🟢 DONE | Finished in 3549ms!. Problem lines might be these: https://github.com/PlasmoHQ/plasmo/blob/main/cli/plasmo/src/commands/build.ts#L44. We might need to check if the result was successful, if not, exit and propagate error code.

[louisgv]

LGTM 👍