ci-automation/vms: Provide OpenStack image without external compression

For Brightbox we can use the OpenStack image but the import only works
with unpacked images. After we enabled internal qcow2 compression the
.gz or .bz2 external compression doesn't provide any benefits and makes
the import more complicated.
Provide the OpenStack image without external compression in addition.
The other files are kept for now but we could also delete them if we
announce this in advance.

Author: pothos

ci-automation/vms.sh

@@ -127,8 +127,10 @@ function _vm_build_impl() {
     for format in ${formats}; do
         echo " ###################  VENDOR '${format}' ################### "
         COMPRESSION_FORMAT="bz2"
-        if [[ "${format}" =~ ^(openstack|openstack_mini|digitalocean)$ ]];then
+        if [[ "${format}" =~ ^(openstack_mini|digitalocean)$ ]];then
             COMPRESSION_FORMAT="gz,bz2"
+        elif [[ "${format}" =~ ^(openstack)$ ]];then
+            COMPRESSION_FORMAT="gz,bz2,none"
         elif [[ "${format}" =~ ^(qemu|qemu_uefi)$ ]];then
             COMPRESSION_FORMAT="bz2,none"
         fi