add standard for end-to-end testing with Tempest

Standards/scs-0128-v1-e2e-testing.md

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+---
+title: SCS end-to-end testing
+type: Standard
+status: Draft
+track: IaaS
+description: |
+  SCS-0128 describes standardized end-to-end testing. It was created to succeed
+  the retired "OpenStack-powered Compute".
+---
+
+## Introduction
+
+From the beginning of the SCS project, it was always intended to reuse and include
+existing standards wherever appropriate, such as the Cloud-Native Computing Foundation's
+"Certified Kubernetes Conformance Program" or the OpenStack Interop working group's
+regulations regarding "OpenStack-powered Compute". Unfortunately, [the latter has been
+retired in September 2025](https://opendev.org/openinfra/interop).
+This standard is meant to carry on the torch.
+
+## Motivation
+
+SCS operators as well as SCS users want to be sure that the infrastructure services
+work as expected.
+
+## Regulations
+
+The end-to-end testing is performed using [Tempest](https://docs.openstack.org/tempest/latest/index.html).
+
+The required tests are listed in
+[Tests/iaas/scs_0128_e2e_testing/tempest-tests-non-admin.lst](https://raw.githubusercontent.com/SovereignCloudStack/standards/refs/heads/main/Tests/iaas/scs_0128_e2e_testing/tempest-tests-non-admin.lst).

Standards/scs-0128-w1-testing-notes.md

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+---
+title: "SCS end-to-end testing: Notes"
+type: Supplement
+track: IaaS
+supplements:
+  - scs-0128-v1-e2e-testing.md
+---
+
+## Tempest introduction
+
+Tempest is the OpenStack Integration Test Suite. It is a set of integration tests to be run against a live OpenStack cluster. Tempest has batteries of tests for OpenStack API validation, scenarios, and other specific tests useful in validating an OpenStack deployment.
+
+See also:
+
+- [Official documentation](https://docs.openstack.org/tempest/latest/)
+- [Current releases (with OpenStack/Python compatibility)](https://docs.openstack.org/tempest/latest/supported_version.html)
+
+## Test cases
+
+SCS conformance tests are expected to be executable without admin privileges (see §2 of
+[Regulations for achieving SCS-compatible certification](https://docs.scs.community/standards/scs-0004-v1-achieving-certification#regulations)).
+The list of test cases stated in the standard has been curated accordingly.
+
+## How to run Tempest against your cluster
+
+_TODO_ provide step-by-step walkthrough here