CAMEL-21334 - use specific ppc64le container image for OpenSearch Integration tests

[apupier]

Description

the ppc64le image is provided separately. The "official" OpenSearch container does not support ppc64le

it will fix tests on main branch

note that I do not have access to a ppc64le machine so cannot test that it is really fixing the issue

Target

• I checked that the commit is targeting the correct branch (note that Camel 3 uses camel-3.x, whereas Camel 4 uses the main branch)

Tracking

• If this is a large change, bug fix, or code improvement, I checked there is a JIRA issue filed for the change (usually before you start working on it).

Apache Camel coding standards and style

• I checked that each commit in the pull request has a meaningful subject line and body.

• I have run mvn clean install -DskipTests locally from root folder and I have committed all auto-generated changes.