dib: Remove Ubuntu Forcal support

Ubuntu Focal is no longer part of the tested environments, because of
newer LTS available now (Jammy).

Change-Id: I7a6df974762abdd94784416609304618ce702b6e

elements/amphora-agent/package-installs.yaml

@@ -7,21 +7,14 @@ build-essential:
   build-only: True
 gcc:
   uninstall: True
-gcc-10:
-  uninstall: True
-  when:
-    - DISTRO_NAME = ubuntu
-    - DIB_RELEASE = focal
 gcc-11:
   uninstall: True
   when:
     - DISTRO_NAME = ubuntu
-    - DIB_RELEASE != focal
 gcc-12:
   uninstall: True
   when:
     - DISTRO_NAME = ubuntu
-    - DIB_RELEASE != focal
 git-man:
   uninstall: True
 perl:

elements/amphora-agent/post-install.d/10-enable-network-scripts

@@ -1,12 +0,0 @@
-#!/bin/bash
-
-if [ ${DIB_DEBUG_TRACE:-0} -gt 0 ]; then
-    set -x
-fi
-
-set -eu
-set -o pipefail
-
-if [[ "$DISTRO_NAME" =~ (ubuntu) ]] && [ "$DIB_RELEASE" == "focal" ]; then
-    systemctl enable systemd-networkd
-fi

releasenotes/notes/remove-forcal-support-2f7991f2d435876f.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    The diskimage-builder elements for amphora image no longer supports Ubuntu
+    Focal.

zuul.d/jobs.yaml

@@ -8,16 +8,6 @@
         - openstack/octavia
         - openstack/octavia-lib
 
-- job:
-    name: publish-openstack-octavia-amphora-image-focal
-    parent: publish-openstack-octavia-amphora-image
-    nodeset: ubuntu-focal
-    description: |
-      Publish Ubuntu Focal (20.04) based amphora image to tarballs.o.o.
-    vars:
-        amphora_os: ubuntu
-        amphora_os_release: focal
-
 - job:
     name: publish-openstack-octavia-amphora-image-jammy
     parent: publish-openstack-octavia-amphora-image
@@ -188,18 +178,6 @@
         amphora_os: ubuntu
         amphora_os_release: jammy
 
-- job:
-    name: octavia-amphora-image-build-live-focal
-    parent: octavia-amphora-image-build
-    description: |
-      Builds an Ubuntu Focal amphora image using diskimage-builder from Git
-      master. This job does not publish the image.
-    required-projects:
-        - openstack/diskimage-builder
-    vars:
-        amphora_os: ubuntu
-        amphora_os_release: focal
-
 - job:
     name: octavia-amphora-image-build-live-jammy
     parent: octavia-amphora-image-build

zuul.d/projects.yaml

@@ -122,10 +122,6 @@
         #- octavia-grenade-skip-level
     periodic:
       jobs:
-        - publish-openstack-octavia-amphora-image-focal:
-            branches:
-              regex: ^stable/.*$
-              negate: true
         - publish-openstack-octavia-amphora-image-jammy:
             branches:
               regex: ^stable/.*$