[8.11] [build] Rename ubi9 image to ubi (#171424) (#172208)

# Backport

This will backport the following commits from `main` to `8.11`:
- [[build] Rename ubi9 image to ubi
(#171424)](#171424)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT
[{"author":{"name":"Jon","email":"[email protected]"},"sourceCommit":{"committedDate":"2023-11-29T17:50:22Z","message":"[build]
Rename ubi9 image to ubi (#171424)\n\nFuture ubi image names will be
version agnostic. Removal of ubi8
TBD.\r\n\r\n---------\r\n\r\nCo-authored-by: Kibana Machine
<[email protected]>","sha":"0796976a274a691221d79c067f9aef947dcf37e9","branchLabelMapping":{"^v8.12.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Operations","release_note:skip","ci:build-os-packages","backport:all-open","v8.12.0"],"number":171424,"url":"https://github.com/elastic/kibana/pull/171424","mergeCommit":{"message":"[build]
Rename ubi9 image to ubi (#171424)\n\nFuture ubi image names will be
version agnostic. Removal of ubi8
TBD.\r\n\r\n---------\r\n\r\nCo-authored-by: Kibana Machine
<[email protected]>","sha":"0796976a274a691221d79c067f9aef947dcf37e9"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v8.12.0","labelRegex":"^v8.12.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/171424","number":171424,"mergeCommit":{"message":"[build]
Rename ubi9 image to ubi (#171424)\n\nFuture ubi image names will be
version agnostic. Removal of ubi8
TBD.\r\n\r\n---------\r\n\r\nCo-authored-by: Kibana Machine
<[email protected]>","sha":"0796976a274a691221d79c067f9aef947dcf37e9"}}]}]
BACKPORT-->

Co-authored-by: Jon <[email protected]>

.buildkite/pipelines/artifacts.yml

@@ -61,7 +61,7 @@ steps:
         - exit_status: '*'
           limit: 1
 
-  - command: KIBANA_DOCKER_CONTEXT=ubi9 .buildkite/scripts/steps/artifacts/docker_context.sh
+  - command: KIBANA_DOCKER_CONTEXT=ubi .buildkite/scripts/steps/artifacts/docker_context.sh
     label: 'Docker Context Verification'
     agents:
       queue: n2-2

.buildkite/scripts/steps/artifacts/docker_context.sh

@@ -26,8 +26,9 @@ case $KIBANA_DOCKER_CONTEXT in
   ubi8)
     DOCKER_CONTEXT_FILE="kibana-ubi8-$FULL_VERSION-docker-build-context.tar.gz"
   ;;
-  ubi9)
-    DOCKER_CONTEXT_FILE="kibana-ubi9-$FULL_VERSION-docker-build-context.tar.gz"
+  ubi)
+    # Currently ubi9.  After ubi8 we're moving to a version agnostic filename
+    DOCKER_CONTEXT_FILE="kibana-ubi-$FULL_VERSION-docker-build-context.tar.gz"
   ;;
   ironbank)
     DOCKER_CONTEXT_FILE="kibana-ironbank-$FULL_VERSION-docker-build-context.tar.gz"

src/dev/build/tasks/os_packages/docker_generator/run.ts

@@ -45,7 +45,7 @@ export async function runDockerGenerator(
 
   let imageFlavor = '';
   if (flags.baseImage === 'ubi8') imageFlavor += `-ubi8`;
-  if (flags.baseImage === 'ubi9') imageFlavor += `-ubi9`;
+  if (flags.baseImage === 'ubi9') imageFlavor += `-ubi`;
   if (flags.ironbank) imageFlavor += '-ironbank';
   if (flags.cloud) imageFlavor += '-cloud';
   if (flags.serverless) imageFlavor += '-serverless';