[8.12] [build] Remove ubi8 (#173873) (#174202)

# Backport

This will backport the following commits from `main` to `8.12`:
- [[build] Remove ubi8
(#173873)](#173873)

<!--- Backport version: 9.4.3 -->

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

<!--BACKPORT
[{"author":{"name":"Jon","email":"jon@elastic.co"},"sourceCommit":{"committedDate":"2024-01-03T16:29:14Z","message":"[build]
Remove ubi8 (#173873)\n\nRHEL 8.10 will be the final ubi8 release. We
already have builds in\r\nplace for transitioning to
ubi9.\r\n\r\nDepends on
https://github.com/elastic/kibana/pull/170264.","sha":"7c2b3f1301803bec477af3f1e9657b8c2821619d","branchLabelMapping":{"^v8.13.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["Team:Operations","release_note:skip","backport:all-open","v8.13.0"],"title":"[build]
Remove
ubi8","number":173873,"url":"https://github.com/elastic/kibana/pull/173873","mergeCommit":{"message":"[build]
Remove ubi8 (#173873)\n\nRHEL 8.10 will be the final ubi8 release. We
already have builds in\r\nplace for transitioning to
ubi9.\r\n\r\nDepends on
https://github.com/elastic/kibana/pull/170264.","sha":"7c2b3f1301803bec477af3f1e9657b8c2821619d"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v8.13.0","branchLabelMappingKey":"^v8.13.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/173873","number":173873,"mergeCommit":{"message":"[build]
Remove ubi8 (#173873)\n\nRHEL 8.10 will be the final ubi8 release. We
already have builds in\r\nplace for transitioning to
ubi9.\r\n\r\nDepends on
https://github.com/elastic/kibana/pull/170264.","sha":"7c2b3f1301803bec477af3f1e9657b8c2821619d"}}]}]
BACKPORT-->

Co-authored-by: Jon <jon@elastic.co>

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

@@ -23,11 +23,7 @@ case $KIBANA_DOCKER_CONTEXT in
   cloud)
     DOCKER_CONTEXT_FILE="kibana-cloud-$FULL_VERSION-docker-build-context.tar.gz"
   ;;
-  ubi8)
-    DOCKER_CONTEXT_FILE="kibana-ubi8-$FULL_VERSION-docker-build-context.tar.gz"
-  ;;
   ubi)
-    # Currently ubi9.  After ubi8 we're moving to a version agnostic filename
     DOCKER_CONTEXT_FILE="kibana-ubi-$FULL_VERSION-docker-build-context.tar.gz"
   ;;
   ironbank)

src/dev/build/tasks/os_packages/create_os_package_tasks.ts

@@ -109,13 +109,7 @@ export const CreateDockerUBI: Task = {
   async run(config, log, build) {
     await runDockerGenerator(config, log, build, {
       architecture: 'x64',
-      baseImage: 'ubi8',
-      context: false,
-      image: true,
-    });
-    await runDockerGenerator(config, log, build, {
-      architecture: 'x64',
-      baseImage: 'ubi9',
+      baseImage: 'ubi',
       context: false,
       image: true,
     });
@@ -154,12 +148,7 @@ export const CreateDockerContexts: Task = {
       dockerBuildDate,
     });
     await runDockerGenerator(config, log, build, {
-      baseImage: 'ubi8',
-      context: true,
-      image: false,
-    });
-    await runDockerGenerator(config, log, build, {
-      baseImage: 'ubi9',
+      baseImage: 'ubi',
       context: true,
       image: false,
     });

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

@@ -29,7 +29,7 @@ export async function runDockerGenerator(
   build: Build,
   flags: {
     architecture?: string;
-    baseImage: 'none' | 'ubi9' | 'ubi8' | 'ubuntu';
+    baseImage: 'none' | 'ubi' | 'ubuntu';
     context: boolean;
     image: boolean;
     ironbank?: boolean;
@@ -40,12 +40,10 @@ export async function runDockerGenerator(
 ) {
   let baseImageName = '';
   if (flags.baseImage === 'ubuntu') baseImageName = 'ubuntu:20.04';
-  if (flags.baseImage === 'ubi8') baseImageName = 'docker.elastic.co/ubi8/ubi-minimal:latest';
-  if (flags.baseImage === 'ubi9') baseImageName = 'docker.elastic.co/ubi9/ubi-minimal:latest';
+  if (flags.baseImage === 'ubi') baseImageName = 'docker.elastic.co/ubi9/ubi-minimal:latest';
 
   let imageFlavor = '';
-  if (flags.baseImage === 'ubi8') imageFlavor += `-ubi8`;
-  if (flags.baseImage === 'ubi9') imageFlavor += `-ubi`;
+  if (flags.baseImage === 'ubi') imageFlavor += `-ubi`;
   if (flags.ironbank) imageFlavor += '-ironbank';
   if (flags.cloud) imageFlavor += '-cloud';
   if (flags.serverless) imageFlavor += '-serverless';

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

@@ -24,7 +24,7 @@ export interface TemplateContext {
   dockerBuildDate: string;
   usePublicArtifact?: boolean;
   publicArtifactSubdomain: string;
-  baseImage: 'none' | 'ubi8' | 'ubi9' | 'ubuntu';
+  baseImage: 'none' | 'ubi' | 'ubuntu';
   baseImageName: string;
   cloud?: boolean;
   serverless?: boolean;

src/dev/build/tasks/os_packages/docker_generator/templates/dockerfile.template.ts

@@ -16,8 +16,8 @@ function generator(options: TemplateContext) {
   const dir = options.ironbank ? 'ironbank' : 'base';
   const template = readFileSync(resolve(__dirname, dir, './Dockerfile'));
   return Mustache.render(template.toString(), {
-    packageManager: options.baseImage.includes('ubi') ? 'microdnf' : 'apt-get',
-    ubi: options.baseImage.includes('ubi'),
+    packageManager: options.baseImage === 'ubi' ? 'microdnf' : 'apt-get',
+    ubi: options.baseImage === 'ubi',
     ubuntu: options.baseImage === 'ubuntu',
     opensslLegacyProvider: !(options.cloud || options.serverless),
     ...options,