samples: npm2100_fuel_gauge: Set build only

Update sample.yaml to build_only.

Signed-off-by: Audun Korneliussen <[email protected]>

Author: nordic-auko

samples/pmic/native/npm2100_fuel_gauge/sample.yaml

@@ -18,6 +18,7 @@ common:
 tests:
   samples.npm2100_fuel_gauge_compile:
     sysbuild: true
+    build_only: true
     platform_allow:
       - nrf52840dk/nrf52840
       - nrf5340dk/nrf5340/cpuapp