gitlab: add a new aarch32 custom runner definition

Although running on aarch64 hardware we can still target 32bit builds
with a cross compiler and run the resulting binaries.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20220225172021.3493923-10-alex.bennee@linaro.org>

.gitlab-ci.d/custom-runners/ubuntu-20.40-aarch32.yml

@@ -0,0 +1,23 @@
+# All ubuntu-20.04 jobs should run successfully in an environment
+# setup by the scripts/ci/setup/qemu/build-environment.yml task
+# "Install basic packages to build QEMU on Ubuntu 18.04/20.04"
+
+ubuntu-20.04-aarch32-all:
+ needs: []
+ stage: build
+ tags:
+ - ubuntu_20.04
+ - aarch32
+ rules:
+ - if: '$CI_PROJECT_NAMESPACE == "qemu-project" && $CI_COMMIT_BRANCH =~ /^staging/'
+   when: manual
+   allow_failure: true
+ - if: "$AARCH32_RUNNER_AVAILABLE"
+   when: manual
+   allow_failure: true
+ script:
+ - mkdir build
+ - cd build
+ - ../configure --cross-prefix=arm-linux-gnueabihf-
+ - make --output-sync -j`nproc`
+ - make --output-sync -j`nproc` check V=1

docs/devel/ci-jobs.rst.inc

@@ -44,6 +44,13 @@ If you've got access to an aarch64 host that can be used as a gitlab-CI
 runner, you can set this variable to enable the tests that require this
 kind of host. The runner should be tagged with "aarch64".
 
+AARCH32_RUNNER_AVAILABLE
+~~~~~~~~~~~~~~~~~~~~~~~~
+If you've got access to an armhf host or an arch64 host that can run
+aarch32 EL0 code to be used as a gitlab-CI runner, you can set this
+variable to enable the tests that require this kind of host. The
+runner should be tagged with "aarch32".
+
 S390X_RUNNER_AVAILABLE
 ~~~~~~~~~~~~~~~~~~~~~~
 If you've got access to an IBM Z host that can be used as a gitlab-CI