Draft: Repair cluster-build pipeline

The introduction of building RHEL8 images on the cluster in MR !1681 (merged) had a flaw: it would recreate image streams on every CI run, thereby losing the association to images in the image registry. In the CI, we change from time to time the ran-base image between tags develop and ci-temp. By recreating the image streams, we quickly lost the association of ran-base:develop, which the CI assumed to "just be there". In this case, most builds would fail, basically bringing the CI to a halt. The actually important change here is in 83736340

Marking as BUILD-ONLY as we cannot test this in the CI: the CI will trigger the normal RHEL8 build on asterix. I will reproduce the scenario we had previously, i.e., trigger this pipeline multiple times in a way that builds will change the ran-base image between ran-base:develop and ran-base:ci-temp. The expected outcome is to always have a successful build, of course.

@lthomas I have additional changes to not use the SSHConnection class, but this will come later. The same with the cleanup of the physims.

ci-scripts/cls_cluster.py

@@ -134,7 +134,7 @@ class Cluster:
 		while timeout_sec > 0:
 			# check status
 			for j in jobs:
-				sshSession.command(f'oc get pods | grep {j}', '\$', 5, silent = True)
+				sshSession.command(f'oc get pods | grep {j}', '\$', 10, silent = True)
 				if sshSession.getBefore().count('Completed') > 0: jobs.remove(j)
 				if sshSession.getBefore().count('Error') > 0:
 					logging.error(f'error for job {j}: ' + sshSession.getBefore())
@@ -345,6 +345,9 @@ class Cluster:
 				imageSize[image] = f'{sizeMb:.1f} Mbytes (uncompressed: ~{sizeMb*2.5:.1f} Mbytes)'
 			logging.info(f'\u001B[1m{image} size is {imageSize[image]}\u001B[0m')
 
+		grep_exp = "\|".join(attemptedImages)
+		mySSH.command(f'oc get images | grep -e \'{grep_exp}\' > cmake_targets/log/image_registry.log', '\$', 10);
+
 		build_log_name = f'build_log_{self.testCase_id}'
 		cls_containerize.CopyLogsToExecutor(mySSH, lSourcePath, build_log_name, lIpAddr, 'oaicicd', CONST.CI_NO_PASSWORD)