Migrate tests to the very latest httpd docker image to unbreak tests.

[Romain-Geissler-1A]

Indeed since Docker 26 the image in the old v1 format are no longer run by default (it used to be deprecated but tolerated for years). Fix this by hardcoding the very latest httpd docker image version as of today.

If you are interested by the actual deprecation description on docker side, it's this one: https://docs.docker.com/engine/deprecated/#pushing-and-pulling-with-image-manifest-v2-schema-1

If fixes errors like this that we have with the current non-regressions tests (extracted from your CI: https://ci.jenkins.io/job/Plugins/job/docker-workflow-plugin/job/PR-312/1/pipeline-console/?selected-node=33)

10:52:10  [Pipeline] withEnv
10:52:10  [Pipeline] {
10:52:10  [Pipeline] sh
10:52:10  + docker inspect -f . httpd:2.4.12
10:52:10  
10:52:10  Error: No such object: httpd:2.4.12
10:52:10  [Pipeline] isUnix
10:52:10  [Pipeline] withEnv
10:52:10  [Pipeline] {
10:52:10  [Pipeline] sh
10:52:10  + docker pull httpd:2.4.12
10:52:10  2.4.12: Pulling from library/httpd
10:52:10  [DEPRECATION NOTICE] Docker Image Format v1 and Docker Image manifest version 2, schema 1 support is disabled by default and will be removed in an upcoming release. Suggest the author of docker.io/library/httpd:2.4.12 to upgrade the image to the OCI Format or Docker Image manifest v2, schema 2. More information at https://docs.docker.com/go/deprecated-image-specs/
10:52:10  [Pipeline] }
10:52:10  [Pipeline] // withEnv
10:52:10  [Pipeline] }
10:52:10  [Pipeline] // withEnv
10:52:10  [Pipeline] }
10:52:10  [Pipeline] // node
10:52:10  [Pipeline] End of Pipeline
10:52:10  ERROR: script returned exit code 1
10:52:10  Finished: FAILURE

I need this as a pre-requisite for another of my pull requests, but this is independant from my other change.

Testing done

Testing done via your own CI.

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[Romain-Geissler-1A]

Friendly ping ;)

[MarkEWaite]

Thanks very much!