Fix grep in all-in-one workflow

Author: Alex-Welsh

.github/workflows/stackhpc-all-in-one.yml

@@ -79,7 +79,7 @@ jobs:
       - name: Output image tag
         id: image_tag
         run: |
-          echo image_tag=$(grep stackhpc_${{ inputs.os_distribution }}_$(sed s/-/_/ <(echo "${{ inputs.os_release }}"))_overcloud_host_image_version etc/kayobe/stackhpc-overcloud-host-images.yml | awk '{print $2}') >> $GITHUB_OUTPUT
+          echo image_tag=$(grep stackhpc_${{ inputs.os_distribution }}_$(sed s/-/_/ <(echo "${{ inputs.os_release }}"))_overcloud_host_image_version: etc/kayobe/stackhpc-overcloud-host-images.yml | awk '{print $2}') >> $GITHUB_OUTPUT
 
       # Use the image override if set, otherwise use overcloud-os_distribution-os_release-tag
       - name: Output image name