honor preconfigopts, buildopts and pretestopts in HPCG easyblock

[Thyre]

(created using eb --new-pr)

Also fixes a small issue where the cmd.sh wouldn't find the correct directory, therefore not placing a user in the build directory where the command was executed.

[boegel]

@boegelbot please test @ jsc-zen3
EB_ARGS="HPCG-3.1-foss-2025b.eb HPCG-3.1-intel-2025b.eb"

[boegelbot]

@boegel: Request for testing this PR well received on jsczen3l1.int.jsc-zen3.fz-juelich.de

PR test command 'if [[ develop != 'develop' ]]; then EB_BRANCH=develop ./easybuild_develop.sh 2> /dev/null 1>&2; EB_PREFIX=/home/boegelbot/easybuild/develop source init_env_easybuild_develop.sh; fi; EB_PR=3986 EB_ARGS="HPCG-3.1-foss-2025b.eb HPCG-3.1-intel-2025b.eb" EB_CONTAINER= EB_REPO=easybuild-easyblocks EB_BRANCH=develop /opt/software/slurm/bin/sbatch --job-name test_PR_3986 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen3.sh' executed!

• exit code: 0
• output:

Submitted batch job 8845

Test results coming soon (I hope)...

- notification for comment with ID 3553358229 processed

Message to humans: this is just bookkeeping information for me,
it is of no use to you (unless you think I have a bug, which I don't).

[boegelbot]

Test report by @boegelbot

Overview of tested easyconfigs (in order)

• SUCCESS HPCG-3.1-foss-2025b.eb
• SUCCESS HPCG-3.1-intel-2025b.eb

Build succeeded for 2 out of 2 (total: 1 min 27 secs) (2 easyconfigs in total)
jsczen3c1.int.jsc-zen3.fz-juelich.de - Linux Rocky Linux 9.6, x86_64, AMD EPYC-Milan Processor (zen3), Python 3.9.21
See https://gist.github.com/boegelbot/0c9fb6194c683159a09b47e561222ca3 for a full test report.

[Thyre]

Tests with preconfigopts set can be found in easybuilders/easybuild-easyconfigs#24517

[boegel]

Provided suggestions are "on sight", I didn't test those myself, but I hope it's clear that what's proposed is a lot more readable...