[PATCH v1 20/25] tests/docker: update and flatten debian-loongarch-cross

["Alex Bennée" <alex.bennee@linaro.org>]

Update to the latest stable Debian. While we are at it 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. In this case it is a
binary distribution of the toolchain anyway.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
---
 tests/docker/Makefile.include                          | 1 -
 tests/docker/dockerfiles/debian-loongarch-cross.docker | 5 ++++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/tests/docker/Makefile.include b/tests/docker/Makefile.include
index a0f5109628..1d5a6f1fb4 100644
--- a/tests/docker/Makefile.include
+++ b/tests/docker/Makefile.include
@@ -128,7 +128,6 @@ docker-image-debian-nios2-cross: $(DOCKER_FILES_DIR)/debian-toolchain.docker \
 	$(call debian-toolchain, $@)
 
 # Specialist build images, sometimes very limited tools
-docker-image-debian-loongarch-cross: docker-image-debian11
 docker-image-debian-microblaze-cross: docker-image-debian10
 docker-image-debian-nios2-cross: docker-image-debian10
 
diff --git a/tests/docker/dockerfiles/debian-loongarch-cross.docker b/tests/docker/dockerfiles/debian-loongarch-cross.docker
index ca2469d2a8..48fe64c51b 100644
--- a/tests/docker/dockerfiles/debian-loongarch-cross.docker
+++ b/tests/docker/dockerfiles/debian-loongarch-cross.docker
@@ -5,7 +5,10 @@
 # using a prebuilt toolchains for LoongArch64 from:
 # https://github.com/loongson/build-tools/releases
 #
-FROM qemu/debian11
+FROM docker.io/library/debian:bullseye-slim
+
+# Duplicate deb line as deb-src
+RUN cat /etc/apt/sources.list | sed "s/^deb\ /deb-src /" >> /etc/apt/sources.list
 
 RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt install -yy eatmydata && \
-- 
2.30.2