[8.11] [build/docker] Upgrade Ubuntu base image to 22.04 (elastic#162282

) (elastic#169580)

# Backport

This will backport the following commits from `main` to `8.11`:
- [[build/docker] Upgrade Ubuntu base image to 22.04
(elastic#162282)](elastic#162282)

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

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

<!--BACKPORT
[{"author":{"name":"Jon","email":"jon@elastic.co"},"sourceCommit":{"committedDate":"2023-10-23T19:49:06Z","message":"[build/docker]
Upgrade Ubuntu base image to 22.04 (elastic#162282)\n\nRelease note:\r\nThe
default container's base image has been upgraded from Ubuntu 20.04\r\nto
22.04","sha":"9d139f6192647a91010e95c84d651644158abc69","branchLabelMapping":{"^v8.12.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["release_note:enhancement","Team:Operations","backport:prev-minor","ci:cloud-redeploy","ci:build-serverless-image","v8.12.0"],"number":162282,"url":"https://github.com/elastic/kibana/pull/162282","mergeCommit":{"message":"[build/docker]
Upgrade Ubuntu base image to 22.04 (elastic#162282)\n\nRelease note:\r\nThe
default container's base image has been upgraded from Ubuntu 20.04\r\nto
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Upgrade Ubuntu base image to 22.04 (elastic#162282)\n\nRelease note:\r\nThe
default container's base image has been upgraded from Ubuntu 20.04\r\nto
22.04","sha":"9d139f6192647a91010e95c84d651644158abc69"}}]}] BACKPORT-->

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

docs/setup/docker.asciidoc

@@ -10,7 +10,7 @@
 :es-docker-image:     {es-docker-repo}:{version}
 
 Docker images for {kib} are available from the Elastic Docker registry. The
-base image is https://hub.docker.com/_/ubuntu[ubuntu:20.04].
+base image is https://hub.docker.com/_/ubuntu[ubuntu:22.04].
 
 A list of all published Docker images and tags is available at
 https://www.docker.elastic.co[www.docker.elastic.co]. The source code is in

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

@@ -39,7 +39,7 @@ export async function runDockerGenerator(
   }
 ) {
   let baseImageName = '';
-  if (flags.baseImage === 'ubuntu') baseImageName = 'ubuntu:20.04';
+  if (flags.baseImage === 'ubuntu') baseImageName = 'ubuntu:22.04';
   if (flags.baseImage === 'ubi8') baseImageName = 'docker.elastic.co/ubi8/ubi-minimal:latest';
   if (flags.baseImage === 'ubi9') baseImageName = 'docker.elastic.co/ubi9/ubi-minimal:latest';
 

src/dev/build/tasks/os_packages/docker_generator/templates/base/Dockerfile

@@ -187,7 +187,7 @@ ENTRYPOINT ["/bin/tini", "--"]
 CMD ["/app/kibana.sh"]
 # Generate a stub command that will be overwritten at runtime
 RUN mkdir /app && \
-    echo -e '#!/bin/bash\nexec /usr/local/bin/kibana-docker' > /app/kibana.sh && \
+    /usr/bin/echo -e '#!/bin/bash\nexec /usr/local/bin/kibana-docker' > /app/kibana.sh && \
     chmod 0555 /app/kibana.sh
 {{/cloud}}