make sdk test more verbose

using compile V=s should give some details in case this test fails.

Signed-off-by: Paul Spooren <mail@aparcar.org>

.gitlab/ci/sdk.yml

@@ -24,5 +24,5 @@ test-sdk:
     - make defconfig
     - ./scripts/feeds update base
     - ./scripts/feeds install busybox
-    - make package/busybox/compile -j$(nproc)
+    - make package/busybox/compile V=s
     - ls ./bin/packages/x86_64/base/busybox*