fa3b5e5e57 ci: Use nproc over MAKEJOBS in 01_base_install (MarcoFalke)
Pull request description:
Currently `$MAKEJOBS` is the default value in `01_base_install.sh` when building the container image.
This problem can't be fixed (see below), so just use `nproc` for now.
Other solutions would be bad:
* Passing in the `MAKEJOBS` as a dockerfile env would create a new image if the number of tasks are changed, seems verbose and confusing.
* Leaving `master` as-is would leave CPUs unused if there are more than `4`.
ACKs for top commit:
fanquake:
ACK - I think this is fine as-is, it's an improvement over the current state fa3b5e5e57
Tree-SHA512: 15014eb7b548945737b0fed5cd46f0cd4b72b1d54d044f60fce628f914053a2de6518878428a54822d236d08d6f257d8c464d3fb589400f4be56022d2ec8676d
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