[PATCH v2 1/5] automation: Switch arm32 cross builds to run on arm64

[Michal Orzel <michal.orzel@xxxxxxx>]

Due to the limited x86 CI resources slowing down the whole pipeline,
switch the arm32 cross builds to be executed on arm64 which is much more
capable. For that, rename the existing debian container dockerfile
from unstable-arm32-gcc to unstable-arm64v8-arm32-gcc and use
arm64v8/debian:unstable as an image. Note, that we cannot use the same
container name as we have to keep the backwards compatibility.
Take the opportunity to remove extra empty line at the end of a file.

Modify the tag of .arm32-cross-build-tmpl to arm64 and update the build
jobs accordingly.

Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
---
Changes in v2:
 - new patch

For convenience and own testing, I built and pushed the new container
to registry.
---
 ...ockerfile => unstable-arm64v8-arm32-gcc.dockerfile} |  3 +--
 automation/gitlab-ci/build.yaml                        | 10 +++++-----
 2 files changed, 6 insertions(+), 7 deletions(-)
 rename automation/build/debian/{unstable-arm32-gcc.dockerfile => 
unstable-arm64v8-arm32-gcc.dockerfile} (94%)

diff --git a/automation/build/debian/unstable-arm32-gcc.dockerfile 
b/automation/build/debian/unstable-arm64v8-arm32-gcc.dockerfile
similarity index 94%
rename from automation/build/debian/unstable-arm32-gcc.dockerfile
rename to automation/build/debian/unstable-arm64v8-arm32-gcc.dockerfile
index b41a57f19729..11860425a6a2 100644
--- a/automation/build/debian/unstable-arm32-gcc.dockerfile
+++ b/automation/build/debian/unstable-arm64v8-arm32-gcc.dockerfile
@@ -1,4 +1,4 @@
-FROM debian:unstable
+FROM arm64v8/debian:unstable
 LABEL maintainer.name="The Xen Project" \
       maintainer.email="xen-devel@xxxxxxxxxxxxxxxxxxxx"
 
@@ -21,4 +21,3 @@ RUN apt-get update && \
         apt-get autoremove -y && \
         apt-get clean && \
         rm -rf /var/lib/apt/lists* /tmp/* /var/tmp/*
-
diff --git a/automation/gitlab-ci/build.yaml b/automation/gitlab-ci/build.yaml
index a053c5c7325d..f8e156e0a994 100644
--- a/automation/gitlab-ci/build.yaml
+++ b/automation/gitlab-ci/build.yaml
@@ -123,7 +123,7 @@
   variables:
     XEN_TARGET_ARCH: arm32
   tags:
-    - x86_64
+    - arm64
 
 .arm32-cross-build:
   extends: .arm32-cross-build-tmpl
@@ -542,26 +542,26 @@ alpine-3.12-clang-debug:
 debian-unstable-gcc-arm32:
   extends: .gcc-arm32-cross-build
   variables:
-    CONTAINER: debian:unstable-arm32-gcc
+    CONTAINER: debian:unstable-arm64v8-arm32-gcc
     HYPERVISOR_ONLY: y
 
 debian-unstable-gcc-arm32-debug:
   extends: .gcc-arm32-cross-build-debug
   variables:
-    CONTAINER: debian:unstable-arm32-gcc
+    CONTAINER: debian:unstable-arm64v8-arm32-gcc
     HYPERVISOR_ONLY: y
 
 debian-unstable-gcc-arm32-randconfig:
   extends: .gcc-arm32-cross-build
   variables:
-    CONTAINER: debian:unstable-arm32-gcc
+    CONTAINER: debian:unstable-arm64v8-arm32-gcc
     HYPERVISOR_ONLY: y
     RANDCONFIG: y
 
 debian-unstable-gcc-arm32-debug-randconfig:
   extends: .gcc-arm32-cross-build-debug
   variables:
-    CONTAINER: debian:unstable-arm32-gcc
+    CONTAINER: debian:unstable-arm64v8-arm32-gcc
     HYPERVISOR_ONLY: y
     RANDCONFIG: y
 
-- 
2.25.1