Drop Gerrit 3.9 image builds and testing

Once we're satisfied that we will not be downgrading from Gerrit 3.10
to 3.9 we can safely drop the 3.9 image builds and testing. Followups
will add forward looking 3.11 image builds and testing.

Depends-On: https://review.opendev.org/c/openstack/project-config/+/937268
Change-Id: Ie46cd8b74147c835fbe5e414d13b3f7d3237c7cf

zuul.d/docker-images/gerrit.yaml

@@ -44,99 +44,6 @@
     vars: *gerrit-base_vars
     files: *gerrit-base_files
 
-# Gerrit 3.9 jobs
-- job:
-    name: system-config-build-image-gerrit-3.9
-    description: Build a gerrit image.
-    parent: system-config-build-image
-    pre-run:
-      - playbooks/zuul/gerrit/repos.yaml
-      - playbooks/zuul/gerrit/submodules.yaml
-    run: playbooks/zuul/gerrit/run.yaml
-    requires: gerrit-base-container-image
-    provides: gerrit-3.9-container-image
-    required-projects: &gerrit_projects_3_9
-      - name: opendev/system-config
-        override-checkout: master
-      - name: gerrit.googlesource.com/gerrit
-        override-checkout: stable-3.9
-      # Backend behavior plugins
-      - name: gerrit.googlesource.com/plugins/commit-message-length-validator
-        override-checkout: v3.9.8
-      - name: gerrit.googlesource.com/plugins/delete-project
-        override-checkout: stable-3.9
-      - name: gerrit.googlesource.com/plugins/hooks
-        override-checkout: v3.9.8
-      - name: gerrit.googlesource.com/plugins/its-base
-        # There is no 3.9 branch
-        override-checkout: master
-      - name: gerrit.googlesource.com/plugins/its-storyboard
-        # There is no 3.9 branch
-        override-checkout: master
-      - name: gerrit.googlesource.com/plugins/plugin-manager
-        override-checkout: v3.9.8
-      - name: gerrit.googlesource.com/plugins/replication
-        override-checkout: v3.9.8
-      - name: gerrit.googlesource.com/plugins/reviewnotes
-        override-checkout: v3.9.8
-      - name: gerrit.googlesource.com/plugins/singleusergroup
-        override-checkout: v3.9.8
-      - name: gerrit.googlesource.com/plugins/webhooks
-        override-checkout: v3.9.8
-      # UI behavior plugins
-      - name: gerrit.googlesource.com/plugins/codemirror-editor
-        override-checkout: v3.9.8
-      - name: gerrit.googlesource.com/plugins/download-commands
-        override-checkout: v3.9.8
-      - name: gerrit.googlesource.com/plugins/gitiles
-        override-checkout: v3.9.8
-      - name: gerrit.googlesource.com/plugins/zuul-results-summary
-        override-checkout: main
-      # Non plugin submodules
-      - name: gerrit.googlesource.com/java-prettify
-        override-checkout: master
-      - name: gerrit.googlesource.com/jgit
-        override-checkout: master
-      - name: gerrit.googlesource.com/polymer-bridges
-        override-checkout: v3.9.8
-    vars: &gerrit_vars_3_9
-      docker_images:
-        - context: docker/gerrit/bazel
-          repository: opendevorg/gerrit
-          target: gerrit
-          path: /home/zuul/src/gerrit.googlesource.com/gerrit
-          tags:
-            - 3.9
-    files: &gerrit_files_3_9
-      - docker/gerrit/base/
-      - docker/gerrit/bazel/
-      - playbooks/zuul/gerrit/
-      - playbooks/test-review.yaml
-      - testinfra/test_gerrit.py
-      - jeepyb/
-      - roles/bazelisk-build/
-
-- job:
-    name: system-config-upload-image-gerrit-3.9
-    description: Build and upload a gerrit image.
-    parent: system-config-upload-image
-    pre-run:
-      - playbooks/zuul/gerrit/repos.yaml
-      - playbooks/zuul/gerrit/submodules.yaml
-    run: playbooks/zuul/gerrit/run.yaml
-    requires: gerrit-base-container-image
-    provides: gerrit-3.9-container-image
-    required-projects: *gerrit_projects_3_9
-    vars: *gerrit_vars_3_9
-    files: *gerrit_files_3_9
-
-- job:
-    name: system-config-promote-image-gerrit-3.9
-    description: Promote a previously published gerrit image to latest.
-    parent: system-config-promote-image
-    vars: *gerrit_vars_3_9
-    files: *gerrit_files_3_9
-
 # Gerrit 3.10 jobs
 - job:
     name: system-config-build-image-gerrit-3.10
@@ -325,11 +232,6 @@
               - name: opendev-buildset-registry
               - name: system-config-build-image-python-builder-3.11-bookworm
                 soft: true
-        - system-config-build-image-gerrit-3.9:
-            dependencies:
-              - name: opendev-buildset-registry
-              - name: system-config-build-image-gerrit-base
-                soft: true
         - system-config-build-image-gerrit-3.10:
             dependencies:
               - name: opendev-buildset-registry
@@ -348,11 +250,6 @@
               - name: opendev-buildset-registry
               - name: system-config-upload-image-python-builder-3.11-bookworm
                 soft: true
-        - system-config-upload-image-gerrit-3.9:
-            dependencies:
-              - name: opendev-buildset-registry
-              - name: system-config-upload-image-gerrit-base
-                soft: true
         - system-config-upload-image-gerrit-3.10:
             dependencies:
               - name: opendev-buildset-registry
@@ -361,5 +258,4 @@
     deploy:
       jobs:
         - system-config-promote-image-gerrit-base
-        - system-config-promote-image-gerrit-3.9
         - system-config-promote-image-gerrit-3.10

zuul.d/project.yaml

@@ -62,23 +62,19 @@
               - name: opendev-buildset-registry
         - system-config-run-graphite
         - system-config-run-keycloak
-        - system-config-run-review-3.9:
-            dependencies:
-              - name: opendev-buildset-registry
-              - name: system-config-build-image-gerrit-3.9
-                soft: true
         - system-config-run-review-3.10:
             dependencies:
               - name: opendev-buildset-registry
               - name: system-config-build-image-gerrit-3.10
                 soft: true
-        - system-config-upgrade-review:
+        # Disabled until we can test the 3.10 -> 3.11 upgrade
-            dependencies:
+        #- system-config-upgrade-review:
-              - name: opendev-buildset-registry
+        #    dependencies:
-              - name: system-config-build-image-gerrit-3.9
+        #      - name: opendev-buildset-registry
-                soft: true
+        #      - name: system-config-build-image-gerrit-3.9
-              - name: system-config-build-image-gerrit-3.10
+        #        soft: true
-                soft: true
+        #      - name: system-config-build-image-gerrit-3.10
+        #        soft: true
         - system-config-build-image-refstack
         - system-config-run-refstack:
             dependencies:
@@ -219,11 +215,6 @@
               - name: opendev-buildset-registry
         - system-config-run-graphite
         - system-config-run-keycloak
-        - system-config-run-review-3.9:
-            dependencies:
-              - name: opendev-buildset-registry
-              - name: system-config-upload-image-gerrit-3.9
-                soft: true
         - system-config-run-review-3.10:
             dependencies:
               - name: opendev-buildset-registry

zuul.d/system-config-run.yaml

@@ -1094,15 +1094,6 @@
       - playbooks/zuul/upgrade-review.yaml
       - zuul.d/docker-images/gerrit.yaml
 
-- job:
-    name: system-config-run-review-3.9
-    parent: system-config-run-review-base
-    description: |
-      Run the playbook for gerrit 3.9 (in a container).
-    requires: gerrit-3.9-container-image
-    vars:
-      zuul_test_gerrit_version: '3.9'
-
 - job:
     name: system-config-run-review-3.10
     parent: system-config-run-review-base
@@ -1112,20 +1103,21 @@
     vars:
       zuul_test_gerrit_version: '3.10'
 
-- job:
+# Disabled until we can test the 3.10 to 3.11 upgrade
-    name: system-config-upgrade-review
+#- job:
-    parent: system-config-run-review-base
+#    name: system-config-upgrade-review
-    description: |
+#    parent: system-config-run-review-base
-      Test we can upgrade a gerrit 3.9 to 3.10
+#    description: |
-    requires:
+#      Test we can upgrade a gerrit 3.9 to 3.10
-      - gerrit-3.9-container-image
+#    requires:
-      - gerrit-3.10-container-image
+#      - gerrit-3.9-container-image
-    vars:
+#      - gerrit-3.10-container-image
-      run_playbooks:
+#    vars:
-        - playbooks/letsencrypt.yaml
+#      run_playbooks:
-        - playbooks/zuul/upgrade-review.yaml
+#        - playbooks/letsencrypt.yaml
-      run_test_playbook: playbooks/zuul/test-review.yaml
+#        - playbooks/zuul/upgrade-review.yaml
-      zuul_test_gerrit_version: '3.9'
+#      run_test_playbook: playbooks/zuul/test-review.yaml
+#      zuul_test_gerrit_version: '3.9'
 
 - job:
     name: system-config-run-static