support individual self signed certificates

[aep-sunlife]

Problem

cargo supports a custom CA bundle, but that may be inconvenient for many users. Can we please support appending individual self signed certificates, similar to how package managers for other programming languages work.

Proposed Solution

No response

Notes

No response

[weihanglo]

Could you expand it a bit more, like

• Which version of Cargo you were using?
• What was the approach you took that is inconvenient with Cargo?
• Why was it inconvenient in your workflow?
• Can you share those prior arts you are looking at?

Thank you!