[RFE] Add more settings for ironic

[e-minguez]

charts/charts/metal3/0.6.5/charts/ironic/templates/configmap.yaml

Line 86 in 2cd22cd

MARIADB_HOST: {{ .Values.global.databaseServiceName }}.{{ .Release.Namespace }}.svc.cluster.local

https://github.com/metal3-io/ironic-image?tab=readme-ov-file#description has some vars that would be nice to expose (for those like myself that are dealing with slow hardware environments) such as:

OS_CONDUCTOR__DEPLOY_CALLBACK_TIMEOUT=4800 - timeout (seconds) to wait for a callback from a deploy ramdisk
OS_CONDUCTOR__INSPECT_TIMEOUT=1800 - timeout (seconds) for waiting for node inspection
OS_CONDUCTOR__CLEAN_CALLBACK_TIMEOUT=1800 - timeout (seconds) to wait for a callback from the ramdisk doing the cleaning
OS_PXE__BOOT_RETRY_TIMEOUT=1200 - timeout (seconds) to enable boot retries.

[e-minguez]

Maybe add some kind of raw variable where folks can put there whatever (?)