In the CI use the OSISM CI image (#1736)

The OSISM CI image is a Ubuntu 22.04 image + prepared Docker
services + preinstalled packages.

The image is available @ osism/ci-image.

Signed-off-by: Christian Berendt <berendt@osism.tech>

terraform/environments/ci.tfvars

@@ -8,8 +8,8 @@
 flavor_manager            = "SCS-4V-8-50s"
 flavor_node               = "SCS-8V-32-100s"
 volume_type               = "ssd"
-image                     = "Ubuntu 22.04"
-image_node                = "Ubuntu 22.04"
+image                     = "OSISM CI"
+image_node                = "OSISM CI"
 availability_zone         = "nova"
 network_availability_zone = "nova"
 volume_availability_zone  = "nova"