tests/docker: flatten debian-powerpc-test-cross

Flatten into a single dockerfile. We really don't need the rest of the
stuff from the QEMU base image just to compile test images.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20220914155950.804707-15-alex.bennee@linaro.org>

.gitlab-ci.d/container-cross.yml

@@ -102,7 +102,6 @@ mipsel-debian-cross-container:
 powerpc-test-cross-container:
   extends: .container_job_template
   stage: containers
-  needs: ['amd64-debian11-container']
   variables:
     NAME: debian-powerpc-test-cross
 

tests/docker/Makefile.include

@@ -137,7 +137,6 @@ docker-image-debian-all-test-cross: docker-image-debian10
 docker-image-debian-loongarch-cross: docker-image-debian11
 docker-image-debian-microblaze-cross: docker-image-debian10
 docker-image-debian-nios2-cross: docker-image-debian10
-docker-image-debian-powerpc-test-cross: docker-image-debian11
 docker-image-debian-riscv64-test-cross: docker-image-debian11
 
 # These images may be good enough for building tests but not for test builds

tests/docker/dockerfiles/debian-powerpc-test-cross.docker

@@ -1,13 +1,15 @@
 #
 # Docker powerpc/ppc64/ppc64le cross-compiler target
 #
-# This docker target builds on the debian Bullseye base image.
+# This docker target builds on the Debian Bullseye base image.
 #
-FROM qemu/debian11
+FROM docker.io/library/debian:11-slim
 
-RUN apt update && \
-    DEBIAN_FRONTEND=noninteractive eatmydata \
-    apt install -y --no-install-recommends \
+RUN export DEBIAN_FRONTEND=noninteractive && \
+    apt-get update && \
+    apt-get install -y eatmydata && \
+    eatmydata apt-get dist-upgrade -y && \
+    eatmydata apt-get install --no-install-recommends -y \
         gcc-powerpc-linux-gnu \
         libc6-dev-powerpc-cross \
         gcc-10-powerpc64-linux-gnu \