automation: disable Yocto jobs

The Yocto jobs take a long time to run. We are changing Gitlab ARM64
runners and the new runners might not be able to finish the Yocto jobs
in a reasonable time.

For now, disable the Yocto jobs by turning them into "manual" trigger
(they need to be manually executed.)

Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>

automation/gitlab-ci/build.yaml

@@ -470,17 +470,20 @@ yocto-qemuarm64:
   extends: .yocto-test-arm64
   variables:
     YOCTO_BOARD: qemuarm64
+  when: manual
 
 yocto-qemuarm:
   extends: .yocto-test-arm64
   variables:
     YOCTO_BOARD: qemuarm
     YOCTO_OUTPUT: --copy-output
+  when: manual
 
 yocto-qemux86-64:
   extends: .yocto-test-x86-64
   variables:
     YOCTO_BOARD: qemux86-64
+  when: manual
 
 # Cppcheck analysis jobs