fix workflow

Author: deusebio

.github/workflows/deploy-to-aks.yaml

@@ -44,7 +44,7 @@ jobs:
           echo "K8S_VERSION=${K8S_VERSION}" >> $GITHUB_ENV
           CKF_VERSION=${{ inputs.ckf_version || env.CKF_VERSION }}
           echo "CKF_VERSION=${CKF_VERSION}" >> $GITHUB_ENV
-          RISK=${{ inputs.risk || "stable" }}
+          RISK=${{ inputs.risk }}
           echo "RISK=${RISK}" >> $GITHUB_ENV
           
           if [[ -z "${{ inputs.uats_branch }}" ]]; then UATS_BRANCH="track/${CKF_VERSION}"; else UATS_BRANCH=${{ inputs.uats_branch }}; fi