The CI can't continue without an apt update, so fail early and properly on any error.
Can be tested with something like: podman run --rm -it --network none mirror.gcr.io/debian:unstable bash -c 'apt-get update ; echo $?'
Also, cleanup the lint install script while touching this (and allow clang-format for scripted-diffs in the rare case that they want to use it to e.g. re-sort includes)
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Also, remove the unused pushd/popd. No command in this file requires a
special PWD.
ACK fa294de4c4f62d01b25989bef048456091161849