feat: add support for configmap CA certs, fixes RHOAIENG-14601

[dhirajsb]

Description

Add support for configmap CA certs
Fixes RHOAIENG-14601

How Has This Been Tested?

Changed secure-db sample to use configmap for CA, and tested deployment in local cluster

Merge criteria:

• The commits and have meaningful messages; the author will squash them after approval or will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[dhirajsb]

Depends on merging #147 first

[tarilabs]

I understand a configmap is created for holding the root CA used for the DB certificates.

I understand this is now a parameter in the MR CR,
so that the operator can use (when provided) the CM to mount the root CA -- which then MLMD can use to communicate with the DB

In general,
/lgtm

is this the way also DSP is doing this? I saw some slack threads but was not there for the conclusion

Thank you!

[dhirajsb]

@tarilabs yes, DSP also uses configmap, but its not something they expose to users in the Dashboard right now.

[Al-Pragliola]

lgtm