fix(relay)!: change default cert format from der to pem

[Arqu]

Description

PEM format is probably the more used option for this use case so switching around defaults. Also adding cert_format so you can specify DER as an alternative.

Breaking Changes

Changes the default cert format for Reloading certificate mode from DER to PEM

Notes & open questions

Change checklist

• Self-review.
• Documentation updates following the style guide, if relevant.
• Tests if relevant.
• All breaking changes documented.
  • List all breaking changes in the above "Breaking Changes" section.
  • Open an issue or PR on any number0 repos that are affected by this breaking change. Give guidance on how the updates should be handled or do the actual updates themselves. The major ones are:
    • quic-rpc
    • iroh-gossip
    • iroh-blobs
    • dumbpipe
    • sendme

[github-actions]

Documentation for this PR has been generated and is available at: https://n0-computer.github.io/iroh/pr/3204/docs/iroh/

Last updated: 2025-03-05T10:32:34Z

[github-actions]

Netsim report & logs for this PR have been generated and is available at: LOGS
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Last updated for commit: 50cd09b

[flub]

• Why does reloading need to choose the cert format while manual does not? Why can't they both use the same format and be done because no one seems to have asked for the other format? And if it does need to be configurable, why only for one of them?
• The cfg is rather suspicious. All of main.rs is server-only surely. Surely we can figure out a way to make this work correctly without having to cfg-spaghetti the code.

[Arqu]

• Why does reloading need to choose the cert format while manual does not? Why can't they both use the same format and be done because no one seems to have asked for the other format? And if it does need to be configurable, why only for one of them?

  • The cfg is rather suspicious. All of main.rs is server-only surely. Surely we can figure out a way to make this work correctly without having to cfg-spaghetti the code.

I guess I just went with providing both since the original was not satisfactory. Moved everything to PEM by default. If the need arises I'll bring back DER and add it to both manual and reloading.

[flub]

Now that's a simple PR :)

[flub]

Please note you need to list this as breaking changes. And need to add the ! to the title.