CI: Introduce new qubes-hw-runner.dockerfile

This container is tied to gitlab-runner environment in the RPis driving the
test systems, not a specific version of Alpine.  Intentionally give it a
generic name so it need not change in the future.

Switch to Alpine 3.24 right away, as it doesn't interact with the 3.18 builds
under test.

The container needs to remain a root container.  By no longer using the
arm64v8 build container for dual-purpose, we can finally make the build
containers be non-root.

No practical change.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Denis Mukhin <dmukhin@ford.com>
Acked-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>

automation/build/alpine/qubes-hw-runner.dockerfile

@@ -0,0 +1,21 @@
+# syntax=docker/dockerfile:1
+FROM --platform=linux/arm64/v8 alpine:3.24
+LABEL maintainer.name="The Xen Project"
+LABEL maintainer.email="xen-devel@lists.xenproject.org"
+
+RUN apk --no-cache add bash
+
+RUN <<EOF
+#!/bin/bash
+    set -eu
+
+    DEPS=(
+          expect
+          openssh-client
+    )
+
+    apk add --no-cache "${DEPS[@]}"
+EOF
+
+USER root
+WORKDIR /build

automation/gitlab-ci/test.yaml

@@ -145,7 +145,7 @@
   extends: .test-jobs-common
   variables:
     # the test controller runs on RPi4
-    CONTAINER: alpine:3.18-arm64v8
+    CONTAINER: alpine:qubes-hw-runner
     LOGFILE: smoke-test.log
     PCIDEV: "03:00.0"
     PCIDEV_INTR: "MSI-X"