Fix custom pipeline

Signed-off-by: Jakub Stejskal <xstejs24@gmail.com>

Author: Frawless

.github/actions/systemtests/generate-matrix/action.yml

@@ -12,32 +12,35 @@ inputs:
     default: ""
   default_agent:
     description: "Default agent value"
-    required: true
+    required: false
     default: "oracle-4cpu-16gb-x86-64"
   default_arch:
     description: "Default architecture value"
-    required: true
+    required: false
     default: "amd64"
   default_strimzi_feature_gates:
     description: "Default value for strimzi_feature_gates"
-    required: true
+    required: false
     default: ""
   default_strimzi_rbac_scope:
     description: "Default value for strimzi_rbac_scope"
-    required: true
+    required: false
     default: "CLUSTER"
   default_cluster_operator_install_type:
     description: "Default value for cluster_operator_install_type"
-    required: true
+    required: false
     default: "bundle"
   default_parallel:
     description: "Number of tests executed in parallel"
+    required: false
     default: "1"
   default_groups:
     description: "Default JUnit5 test groups that will be executed"
+    required: false
     default: ""
   default_tests:
     description: "Default JUnit5 tests that will be executed"
+    required: false
     default: ""
   runnerArch:
     description: "Architecture of GitHub runner"