use clean_dir instead of remove_dir on installation directory in custom easyblock for Anaconda

[smoors]

(created using eb --new-pr)

requires:

• add clean_dir function, use it to try to empty install dir if removing it fails easybuild-framework#4932

[smoors]

Test report by @smoors

Overview of tested easyconfigs (in order)

• SUCCESS Mamba-23.11.0-0.eb

Build succeeded for 1 out of 1 (1 easyconfigs in total)
node600.hydra.os - Linux Rocky Linux 9.6, x86_64, AMD EPYC 9384X 32-Core Processor (zen4), Python 3.9.21
See https://gist.github.com/smoors/9b7e3d709100d8a9841e9e94f564e39d for a full test report.

[boegel]

@boegelbot please test @ jsc-zen3
EB_ARGS="--installpath /tmp/boegelbot/pr3934 Anaconda3-2023.09-0.eb Anaconda3-2025.06-1.eb Mamba-23.11.0-0.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=3934 EB_ARGS="--installpath /tmp/boegelbot/pr3934 Anaconda3-2023.09-0.eb Anaconda3-2025.06-1.eb Mamba-23.11.0-0.eb" EB_CONTAINER= EB_REPO=easybuild-easyblocks EB_BRANCH=develop /opt/software/slurm/bin/sbatch --job-name test_PR_3934 --ntasks=8 ~/boegelbot/eb_from_pr_upload_jsc-zen3.sh' executed!

• exit code: 0
• output:

Submitted batch job 10051

Test results coming soon (I hope)...

Details

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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).

[boegel]

lgtm

[boegelbot]

Test report by @boegelbot

Overview of tested easyconfigs (in order)

• SUCCESS Anaconda3-2023.09-0.eb

• SUCCESS Anaconda3-2025.06-1.eb

• SUCCESS Mamba-23.11.0-0.eb

Build succeeded for 3 out of 3 (total: 7 mins 51 secs) (3 easyconfigs in total)
jsczen3c1.int.jsc-zen3.fz-juelich.de - Linux Rocky Linux 9.7, x86_64, AMD EPYC-Milan Processor (zen3), Python 3.9.25
See https://gist.github.com/boegelbot/252a404b128a464ceba394e7a1b90e34 for a full test report.