... in the style of bookworm-ppc64le

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Anthony PERARD <anthony.perard@vates.tech>
CC: Juergen Gross <jgross@suse.com>
CC: Roger Pau Monné <roger.pau@citrix.com>
CC: Jan Beulich <JBeulich@suse.com>
CC: Stefano Stabellini <sstabellini@kernel.org>
CC: Julien Grall <julien@xen.org>
CC: Oleksii Kurochko <oleksii.kurochko@gmail.com>
CC: Shawn Anastasio <sanastasio@raptorengineering.com>
---
 .../build/debian/bullseye-ppc64le.dockerfile  | 51 ++++++++++---------
 1 file changed, 26 insertions(+), 25 deletions(-)

diff --git a/automation/build/debian/bullseye-ppc64le.dockerfile b/automation/build/debian/bullseye-ppc64le.dockerfile
index e166d205f38c..d846b670d02c 100644
--- a/automation/build/debian/bullseye-ppc64le.dockerfile
+++ b/automation/build/debian/bullseye-ppc64le.dockerfile
@@ -1,32 +1,33 @@
 # syntax=docker/dockerfile:1
 FROM --platform=linux/amd64 debian:bullseye-slim
-LABEL maintainer.name="The Xen Project" \
-      maintainer.email="xen-devel@lists.xenproject.org"
+LABEL maintainer.name="The Xen Project"
+LABEL maintainer.email="xen-devel@lists.xenproject.org"
 
 ENV DEBIAN_FRONTEND=noninteractive
-ENV USER root
+ENV CROSS_COMPILE=powerpc64le-linux-gnu-
+ENV XEN_TARGET_ARCH=ppc64
 
-# Add compiler path
-ENV CROSS_COMPILE powerpc64le-linux-gnu-
+RUN <<EOF
+#!/bin/bash
+    set -e
 
-RUN mkdir /build
-WORKDIR /build
+    useradd --create-home user
+
+    apt-get -y update
+
+    DEPS=(
+        # Xen
+        bison
+        build-essential
+        checkpolicy
+        flex
+        gcc-powerpc64le-linux-gnu
+        python3-minimal
+    )
 
-# build depends
-RUN apt-get update && \
-    apt-get --quiet --yes --no-install-recommends install \
-        bison \
-        build-essential \
-        checkpolicy \
-        flex \
-        gawk \
-        gcc-powerpc64le-linux-gnu \
-        make \
-        python3-minimal \
-        # QEMU runtime dependencies for test phase
-        libglib2.0-0 \
-        libpixman-1-0 \
-        && \
-        apt-get autoremove -y && \
-        apt-get clean && \
-        rm -rf /var/lib/apt/lists* /tmp/* /var/tmp/*
+    apt-get -y --no-install-recommends install "${DEPS[@]}"
+    rm -rf /var/lib/apt/lists/*
+EOF
+
+USER user
+WORKDIR /build
-- 
2.39.2