Fix the sed command to update image sha (#571)

* Fix the sed command to update image sha

* final fix

Author: shatakshiiii

.github/workflows/tox.yml

@@ -135,7 +135,7 @@ jobs:
           cd ansible-devspaces-demo
           git checkout -b update-devspaces-image-${{ github.event.release.tag_name }}
           export SHA=$(docker manifest inspect -v ghcr.io/ansible/ansible-devspaces:latest | jq -r '[.Descriptor.digest][0]')
-          sed -i "s|image:.*|image: ghcr.io/ansible/ansible-devspaces@${{ env.SHA }}|" devfile.yaml
+          sed -i "s|image:.*|image: ghcr.io/ansible/ansible-devspaces@${SHA}|" devfile.yaml
           git add devfile.yaml
           git commit -m "Update devspaces container image SHA"
           git push origin update-devspaces-image-${{ github.event.release.tag_name }}