ci(integration): switch linstor-client install to GitHub tarball

[kvaps]

Summary

The integration job's linstor-client install step was failing on ubuntu-latest (noble). Switch it to a working install path that gets PR CI back to green.

Why the previous attempts failed

• apt-get install -y linstor-client python3-linstor → Unable to locate package. LINBIT only ships debs for Debian (bookworm/bullseye/buster/trixie) and on the LINBIT PPA; neither covers noble.
• python3 -m pip install --break-system-packages linstor-client python-linstor → No matching distribution found for linstor-client. Only python-linstor is on PyPI; linstor-client and the bare linstor package name are not.

What works

Install path validated locally inside a fresh ubuntu:24.04 container:

1. pip install python-linstor==1.27.1 argcomplete from PyPI (the runtime deps).
2. pip install --no-deps https://github.com/LINBIT/linstor-client/archive/refs/tags/v1.27.1.tar.gz from GitHub. --no-deps is needed to dodge an upstream setup.py typo (missing comma joins python3-setuptools + python-linstor into one malformed requirement name); the runtime deps are pinned explicitly in step 1.

After install, linstor --version prints linstor-client 1.27.1; GIT-hash: UNKNOWN, which is the exact version tests/integration/group_h_test.go is written against.

Tradeoffs

• Pinned to v1.27.1. When v1.27.2+ ships with a fixed setup.py, we can drop --no-deps and either bump the pin or float to a range. The pin is intentional (matches what the integration harness asserts on), not just a workaround.
• We could alternatively run the whole job inside piraeusdatastore/piraeus-client (option 5 from the task), but that image is last-updated June 2024 and would still pin us to v1.22.1. The tarball path gets us 1.27.1 with zero infra moving parts.

How to verify

Locally:

docker run --rm ubuntu:24.04 bash -c '
  apt-get update -qq >/dev/null 2>&1
  apt-get install -y --no-install-recommends python3 python3-pip ca-certificates curl >/dev/null 2>&1
  python3 -m pip install --break-system-packages --upgrade python-linstor==1.27.1 argcomplete
  python3 -m pip install --break-system-packages --no-deps https://github.com/LINBIT/linstor-client/archive/refs/tags/v1.27.1.tar.gz
  linstor --version
'

In CI: watch the Integration job on this PR — the Install linstor-client step should finish with linstor-client 1.27.1; GIT-hash: UNKNOWN and subsequent integration tests should run.

Related

The pull-request.yml consolidated workflow (on branch ci/pull-request-pipeline, PR #6) has an equivalent broken install step using pip install linstor-client python-linstor and a continue-on-error: true muzzle on the integration job. That branch needs the same fix applied + continue-on-error: true dropped — handled separately since the file does not exist on main yet.

[gemini-code-assist]

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[kvaps]

Superseded by #10 (bundled with the other two CI cleanups so the pipeline runs once).