tests/docker: update and flatten debian-all-test-cross

Update to the latest stable Debian. While we are at it flatten into a
single dockerfile. We also need to ensure we install clang as it is
used for those builds as well.

It would be nice to port this to lcitool but for now this will do.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220914155950.804707-24-alex.bennee@linaro.org>

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

@@ -14,7 +14,6 @@ amd64-debian-cross-container:
 amd64-debian-user-cross-container:
   extends: .container_job_template
   stage: containers
-  needs: ['amd64-debian10-container']
   variables:
     NAME: debian-all-test-cross
 

tests/docker/Makefile.include

@@ -129,7 +129,6 @@ docker-image-debian-nios2-cross: $(DOCKER_FILES_DIR)/debian-toolchain.docker \
 	$(call debian-toolchain, $@)
 
 # Specialist build images, sometimes very limited tools
-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

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

@@ -6,16 +6,24 @@
 # basic compilers for as many targets as possible. We shall use this
 # to build and run linux-user tests on GitLab
 #
-FROM qemu/debian10
+FROM docker.io/library/debian:11-slim
 
-# What we need to build QEMU itself
-RUN apt update && \
-    DEBIAN_FRONTEND=noninteractive eatmydata \
+# Duplicate deb line as deb-src
+RUN cat /etc/apt/sources.list | sed "s/^deb\ /deb-src /" >> /etc/apt/sources.list
+
+RUN export DEBIAN_FRONTEND=noninteractive && \
+    apt-get update && \
+    apt-get install -y eatmydata && \
+    eatmydata apt-get dist-upgrade -y && \
     apt build-dep -yy qemu
 
-# Add the foreign architecture we want and install dependencies
+# Add extra build tools and as many cross compilers as we can for testing
 RUN DEBIAN_FRONTEND=noninteractive eatmydata \
         apt install -y --no-install-recommends \
+        ccache \
+        clang  \
+        git \
+        ninja-build \
         gcc-aarch64-linux-gnu \
         libc6-dev-arm64-cross \
         gcc-alpha-linux-gnu \