add explicit values for PRs from forks (#2555)

Author: BBBmau

.github/workflows/acceptance_tests_kind.yaml

@@ -26,9 +26,9 @@ on:
 
 env:
   KUBECONFIG: ${{ github.workspace }}/.kube/config
-  KIND_VERSION: ${{ github.event.inputs.kindVersion || vars.KIND_VERSION }}
-  PARALLEL_RUNS: ${{ github.event.inputs.parallelRuns || vars.PARALLEL_RUNS }}
-  TERRAFORM_VERSION: ${{ github.event.inputs.terraformVersion || vars.TERRAFORM_VERSION }}
+  KIND_VERSION: ${{ github.event.inputs.kindVersion || vars.KIND_VERSION || '0.23.0' }}
+  PARALLEL_RUNS: ${{ github.event.inputs.parallelRuns || vars.PARALLEL_RUNS || '8' }}
+  TERRAFORM_VERSION: ${{ github.event.inputs.terraformVersion || vars.TERRAFORM_VERSION || '1.9.2' }}
 
 jobs:
   acceptance_tests_kind: