Allow non tagged index image in IIB_GRAPH_MODE_INDEX_ALLOW_LIST

[xDaile]

Related isssue: CLOUDDST-22149

This change allows us to specify index images without a tag to use with the graph_update_mode parameter.

[chandwanitulsi]

lgtm, Jan's comment should be addressed before merge and we should also ensure that in the release, IIB_GRAPH_MODE_INDEX_ALLOW_LIST is updated in playbooks

[xDaile]

lgtm, Jan's comment should be addressed before merge and we should also ensure that in the release, IIB_GRAPH_MODE_INDEX_ALLOW_LIST is updated in playbooks

We do not need to update IIB_GRAPH_MODE_INDEX_ALLOW_LIST exactly before merge, as the solution will also work with the current config.

[chandwanitulsi]

lgtm, Jan's comment should be addressed before merge and we should also ensure that in the release, IIB_GRAPH_MODE_INDEX_ALLOW_LIST is updated in playbooks

We do not need to update IIB_GRAPH_MODE_INDEX_ALLOW_LIST exactly before merge, as the solution will also work with the current config.

Not before merge, before the release or create another issue to update the config in playbook, otherwise we might forget to update

[xDaile]

lgtm, Jan's comment should be addressed before merge and we should also ensure that in the release, IIB_GRAPH_MODE_INDEX_ALLOW_LIST is updated in playbooks

We do not need to update IIB_GRAPH_MODE_INDEX_ALLOW_LIST exactly before merge, as the solution will also work with the current config.

Not before merge, before the release or create another issue to update the config in playbook, otherwise we might forget to update

Opened Gitlab MR with updated config (If we merge Gitlab MR first or together with this PR, we do not need to think of this during the next release).