Update test case for ade commands tests

This commit applies the required changes to the ade test case so
it can be executed in LAVA.

The change consists in adding the `git-repos` directive so it
can fetch the tests scripts from LAVA.

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

test-cases/ade-commands.yaml

@@ -13,10 +13,6 @@ metadata:
   pre-conditions:
     - "Network connectivity on the DUT as these tests fetch sysroot images over
        the network."
-    - "Clone the apertis-tests repository:"
-    - $ git clone https://git.apertis.org/git/apertis-tests.git
-    - "Change directory to apertis-tests folder:"
-    - $ cd apertis-tests
 
   expected:
     - "The automated test should succeed:"
@@ -31,8 +27,15 @@ metadata:
     - |
         >TEST_RESULT:fail:ade-tests-custom:
 
+install:
+  git-repos:
+    - url: https://git.apertis.org/git/apertis-tests.git
+      branch: master
+
 run:
   steps:
+    - "# Enter test directory:"
+    - cd apertis-tests
     - "# Run the ade-tests-custom.sh and ade-tests-defaults.sh script from the ade/
        directory"
     - common/run-test-in-systemd --timeout=30min --name=run-test ade/ade-tests-custom.sh