Update test-cloud workflow

Author: dflook

.github/workflows/test-cloud.yaml

@@ -119,9 +119,9 @@ jobs:
         run: |
           mkdir fixed-workspace-name
           if [[ "${{ matrix.tf_version }}" == "0.13" ]]; then
-            sed -e 's/prefix.*/name = "github-actions-0-13-${HEAD_REF}-1"/' tests/workflows/test-cloud/${{ matrix.tf_version }}/main.tf > fixed-workspace-name/main.tf
+            sed -e 's/prefix.*/name = "github-actions-0-13-'"$HEAD_REF"'-1"/' tests/workflows/test-cloud/${{ matrix.tf_version }}/main.tf > fixed-workspace-name/main.tf
           else
-            sed -e 's/prefix.*/name = "github-actions-1-1-${HEAD_REF}-1"/' tests/workflows/test-cloud/${{ matrix.tf_version }}/main.tf > fixed-workspace-name/main.tf
+            sed -e 's/prefix.*/name = "github-actions-1-1-'"$HEAD_REF"'-1"/' tests/workflows/test-cloud/${{ matrix.tf_version }}/main.tf > fixed-workspace-name/main.tf
           fi
 
       - name: Get outputs