CI: add basic selftest job

Currently this just executes the runfvp tests, but we can extend it over
time.

Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

.gitlab-ci.yml

@@ -25,7 +25,7 @@ stages:
     - mkdir --verbose --parents $KAS_WORK_DIR $KAS_REPO_REF_DIR $SSTATE_DIR $DL_DIR $TOOLCHAIN_DIR $TOOLCHAIN_LINK_DIR
     # Must do this here, as it's the only way to make sure the toolchain is installed on the same builder
     - ./ci/get-binary-toolchains $DL_DIR $TOOLCHAIN_DIR $TOOLCHAIN_LINK_DIR
-    - sudo apt update && sudo apt install telnet -y
+    - sudo apt update && sudo apt install --yes telnet python3-subunit
 
 # Generalised fragment to do a Kas build
 .build:
@@ -201,6 +201,12 @@ tc1:
 toolchains:
   extends: .build
 
+selftest:
+  extends: .setup
+  script:
+    - KASFILES=./ci/qemuarm64.yml:./ci/selftest.yml
+    - kas shell --update --force-checkout $KASFILES -c 'oe-selftest --num-processes 1 --run-tests runfvp'
+
 # Validate layers are Yocto Project Compatible
 check-layers:
   extends: .setup

ci/selftest.yml

@@ -0,0 +1,7 @@
+header:
+  version: 11
+
+local_conf_header:
+  setup: |
+    BB_LOGCONFIG = ""
+    SANITY_TESTED_DISTROS = ""