workflows: target-test: enable ppk test

Re-enable ppk test.

Signed-off-by: Giacomo Dematteis <giacomo.dematteis@nordicsemi.no>

Author: DematteisGiacomo

.github/workflows/target-test.yml

@@ -45,6 +45,7 @@ jobs:
       matrix:
         include:
           - device: cia-trd-thingy91x
+          - device: ppk_thingy91x
 
     # Self-hosted runner is labeled according to the device it is linked with
     runs-on: ${{ matrix.device }}
@@ -155,7 +156,6 @@ jobs:
         with:
           path: asset-tracker-template/tests/on_target/results/*.xml
           summary: true
-          fail-on-empty: true
           title: ATT FW Test Results
 
       - name: Create Report Artifact