Add fdp_update_container_images role for control plane updates

Implement container image rebuild automation for FDP updates:
- Role fdp_update_container_images: Rebuilds container images with updated packages
  * Includes Molecule tests for validation
  * Jinja2 templates for Dockerfile and repo configuration
- Integration in post-deployment.yml with variable validation
- Zuul CI configuration for automated testing

This role enables updating Fast Data Path components in OpenStack
control plane containers by rebuilding images with updated RPM packages
from a specified repository. Part of the broader FDP update workflow,
focusing specifically on container image management.

Assisted-By: Claude <[email protected]>
Signed-off-by: Miguel Angel Nieto Jimenez <[email protected]>

Author: mnietoji

zuul.d/molecule.yaml

@@ -945,6 +945,15 @@
     - ^.config/molecule/.*
     name: cifmw-molecule-federation
     parent: cifmw-molecule-noop
+- job:
+    files:
+    - ^common-requirements.txt
+    - ^test-requirements.txt
+    - ^roles/fdp_update_container_images/.*
+    - ^ci/playbooks/molecule.*
+    - ^.config/molecule/.*
+    name: cifmw-molecule-fdp_update_container_images
+    parent: cifmw-molecule-noop
 - job:
     files:
     - ^common-requirements.txt