gitlab: split deprecated job into build/check stages

While the job is pretty fast for only a few targets we still want to
catch breakage of the build. By splitting the test step we can
allow_failures for that while still ensuring we don't miss the build
breaking.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20201002091538.3017-1-alex.bennee@linaro.org>

.gitlab-ci.yml

@@ -270,9 +270,24 @@ build-deprecated:
   variables:
     IMAGE: debian-all-test-cross
     CONFIGURE_ARGS: --disable-docs --disable-tools
-    MAKE_CHECK_ARGS: check-tcg
+    MAKE_CHECK_ARGS: build-tcg
     TARGETS: ppc64abi32-linux-user tilegx-linux-user lm32-softmmu
       unicore32-softmmu
+  artifacts:
+    expire_in: 2 days
+    paths:
+      - build
+
+# We split the check-tcg step as test failures are expected but we still
+# want to catch the build breaking.
+check-deprecated:
+  <<: *native_test_job_definition
+  needs:
+    - job: build-deprecated
+      artifacts: true
+  variables:
+    IMAGE: debian-all-test-cross
+    MAKE_CHECK_ARGS: check-tcg
   allow_failure: true
 
 build-oss-fuzz: