[5.4] Update OpenLDAP container image in CI workflow to use own mirror image

[LadySolveig]

Pull Request for Issue # .

Summary of Changes

As we reach the rate limit on docker hub for the tests. This should only be a proof of concept if we could use a mirror image from the Github registry for the OpenLDAP image.

Testing Instructions

Running automated tests.

Actual result BEFORE applying this Pull Request

Tests are blocked by rate limit.

Expected result AFTER applying this Pull Request

Tests can run again.

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[richard67]

I have tested this item ✅ successfully on 92709ae

The step "Start LDAP container" in the integration tests uses our mirror image.

No rate limit happens.

In comparison, the same fails for PR #45910 due to the rate limit for the LDAP download, as we have it occasionally seen for other PRs.

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45912.}

[bembelimen]

I have tested this item ✅ successfully on 92709ae

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45912.}

[richard67]

RTC

---

_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/45912.}

[muhme]

✅ Final check before merge:

• Docker error toomanyrequests: You have reached your unauthenticated pull rate limit. seen this morning in 5.4-dev branch
• GitHub action Run integration tests > Start LDAP container works with own cloned Docker image in this PR

[muhme]

Thank you @LadySolveig for your contribution. Thank you @richard67 and @bembelimen for testing.