Running npm the first time on `aws/codebuild/standard:7.0` takes 12 seconds

Running `npm` CLI for the first time on CodeBuild takes 12s seconds. And that's in 15 GB memory, 8 vCPUs.

```
root@4caf6b2d0339:/tmp# time npm -v
10.2.4

real 0m12.660s
user 0m0.261s
sys 0m0.079s
```

I suspect it has something to do with corepack. It silently tries to update `npm` or maybe `apt-get`; I think it has a similar behaviour.

But I tried disabling corepack via `corepack disable` and also setting various env options to turn off different behaviours. But nothing seems to have any effect.

Any ideas?

Shouldn't npm be pre-installed by default?

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