CI: retain only licenses as build artifacts

There is little point in retaining full set of build artifacts for the
test builds, which is what the empty "artifacts" config does. Keep just
the licences and throw away everything else.

Signed-off-by: Dmitry Baryshkov <[email protected]>

.github/workflows/build-template.yml

@@ -67,7 +67,7 @@ jobs:
           target: ${{inputs.images}}
           bblayers_conf:
             - BBLAYERS += '../$(echo ${{github.repository}} | cut -d'/' -f2)'
-          artifacts: []
+          artifacts: ["licenses"]
         EOF
 
         for tclibc in ${TCLIBC}; do