enable flat directory certificate store for k8s cert-manager compatibility

[cristipogacean]

Purpose

• add support for flat directory certificate store for k8s cert manager compatibility
• handle .crt and .key certificate types

Does this introduce a breaking change?

[ ] Yes
[x] No

Pull Request Type

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information

[mregen]

isn't this ever called once?

[cristipogacean]

It should normally be only called once. In the unit tests it is called for every test though.

[luiscantero]

btw: Would it be difficult to add unit tests for this? can be done in separate PR.

[luiscantero]