ci: test-e2e-podman ignores ARM matrix entry due to hardcoded runs-on

[Ankitsinghsisodya]

Problem

In .github/workflows/functions.yaml, the test-e2e-podman job defines a strategy matrix with two OS entries:

strategy:
  matrix:
    os:
      - "ubuntu-latest"    # x86_64
      - "ubuntu-24.04-arm" # ARM64

However, runs-on is hardcoded to ubuntu-latest instead of referencing the matrix:

runs-on: ubuntu-latest

This means both matrix entries run on the same x86_64 runner, so the ARM64 variant is never actually tested on ARM hardware. CI time is wasted on a duplicate x86_64 run.

Fix

Change runs-on: ubuntu-latest to runs-on: ${{ matrix.os }} so each matrix entry runs on the correct runner.

[Ankitsinghsisodya]

/assign