include SHA256SUM

Author: tobiasmcnulty

.github/workflows/release.yaml

@@ -32,7 +32,10 @@ jobs:
           git clone https://opendev.org/openstack/octavia -b stable/${{ env.openstack_version }}
           cd octavia/diskimage-create
           ./diskimage-create.sh
+          sha256sum amphora-x64-haproxy.qcow2 > SHA256SUM
       - name: Release
         uses: softprops/action-gh-release@v1
         with:
-          files: octavia/diskimage-create/amphora-x64-haproxy.qcow2
+          files: |
+            octavia/diskimage-create/amphora-x64-haproxy.qcow2
+            octavia/diskimage-create/SHA256SUM