My Xcode Cloud builds have also stopped working due to this issue forcing me to go back to manual builds and uploads. It's been huge setback. I'm responsible for 5 Capacitor hybrid apps that require many npm dependencies.The Post-Clone script timed out. No activity has been detected on stdout or stderr in 15 minutes. while npm ci. For me, the last logs I see are consistently:
npm WARN deprecated sourcemap-codec@1.4.8: Please use @jridgewell/sourcemap-codec instead
cemap-codec instead
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Switching to Yarn worked for me as well.