build: fix GH secret reference (missing \$)

Author: aliziel

.github/workflows/ci.yaml

@@ -42,7 +42,7 @@ jobs:
           validate: true
           format: true
           arg-var-file: ${{ env.VAR_FILE }}
-          arg-var: cluster_ci_access_role_arn=${{ secrets.AWS_OIDC_ROLE }},cluster_admin_access_role_arns={{ secrets.CLUSTER_ADMIN_ACCESS_ROLE_ARNS }}
+          arg-var: cluster_ci_access_role_arn=${{ secrets.AWS_OIDC_ROLE }},cluster_admin_access_role_arns=${{ secrets.CLUSTER_ADMIN_ACCESS_ROLE_ARNS }}
           label-pr: false
       - name: Get TF Outputs
         run: |