bug: node is still being called even when NODE_EXEC=bun is passed

[SgtPooki]

while working on ipfs-examples/helia-examples#101, test-ipfs-example is somehow calling node /home/runner/work/helia-examples/helia-examples/examples/helia-101/201-storage.js

see https://github.com/ipfs-examples/helia-examples/actions/runs/11505906844/job/32028654572?pr=101#step:6:51

The error in that CI can be bypassed by installing node>=20 (that has CustomEvent), but the real problem is that test-ipfs-example is calling node at all.

[SgtPooki]

disregard... ipfs-examples/helia-examples@e4bd598 (#101)