fix: use outer product on matrix job

benchmarks/single/config.yml

@@ -12,8 +12,8 @@ single:simulate:
   parallel:
     matrix:
       - particle: ['e-', 'pi-']
-      - energy: ['1GeV']
-      - angle: ['3to45deg', '45to135deg', '135to177deg']
+        energy: ['1GeV']
+        angle: ['3to45deg', '45to135deg', '135to177deg']
   script:
     - bash benchmarks/single/simulate.sh ${particle}_${energy}_${angle}
     - bash benchmarks/single/reconstruct.sh ${particle}_${energy}_${angle}