Persistent TLS certificates

[metachris]

This pull request introduces support for specifying file paths for storing generated TLS certificates and keys in the receiver-proxy component. It also updates the test suite to accommodate these changes.

New mandatory orderflow-proxy-receiver flags / env vars:

1. --cert-path / CERT_PATH
2. --cert-key-path / CERT_KEY_PATH

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Below are the most important changes grouped by theme:

TLS Certificate Management:

• Added new flags cert-path and cert-key-path to specify file paths for storing TLS certificates and keys in cmd/receiver-proxy/main.go. These flags are validated to ensure they are set. [1] [2] [3] [4]
• Updated ReceiverProxyConfig in proxy/receiver_proxy.go to include CertPath and CertKeyPath fields.
• Modified the NewReceiverProxy function to use utils_tls.GetOrGenerateTLS, which either retrieves existing certificates from the specified paths or generates new ones.

Dependency Update:

• Updated the github.com/flashbots/go-utils dependency in go.mod to a newer version.

Test Suite Updates:

• Updated test functions in proxy/receiver_proxy_test.go to pass certPath and certKeyPath arguments, ensuring the new certificate management logic is tested. [1] [2] [3] [4] [5]

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Needs flashbots/go-utils#44 -- should merge that one first and then tag and update the dep.

[Copilot]

Pull Request Overview

This PR introduces persistent TLS certificate management for the receiver-proxy component by adding new CLI flags, updating the proxy configuration, and modifying the test suite to accommodate these changes.

• Introduces the flags cert-path and cert-key-path in receiver-proxy’s main package.
• Modifies the proxy constructor to use utils_tls.GetOrGenerateTLS for certificate management.
• Updates tests to supply file paths for certificates.

Reviewed Changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

File	Description
proxy/receiver_proxy_test.go	Updated test helper functions to include certificate file path args.
proxy/receiver_proxy.go	Added CertPath and CertKeyPath fields and updated TLS certificate logic.
cmd/receiver-proxy/main.go	Registered new CLI flags and updated main logic to validate TLS file paths.

Files not reviewed (1)

• go.mod: Language not supported

[dvush]

I approve with comment about test.