feat: add TLS configuration support to Go SDK

[markphelps]

Re: #1132

Like: #1137 , #1136 , #1135

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.31%. Comparing base (f701007) to head (3dfbdc5).
Report is 442 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1138      +/-   ##
==========================================
- Coverage   80.36%   75.31%   -5.05%     
==========================================
  Files           8        9       +1     
  Lines        4165     4477     +312     
==========================================
+ Hits         3347     3372      +25     
- Misses        818     1105     +287     

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[Copilot]

Pull Request Overview

This PR adds TLS configuration support to the Go SDK, enabling secure HTTPS connections with custom certificate handling.

• Introduces a WithTlsConfig option for custom tls.Config
• Updates tests and runner containers to use HTTPS and load CA certificates
• Expands README with TLS usage examples and bumps engine FFI version

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
test/main.go	Enabled HTTPS in test containers via useHTTPS and CA cert mounts
flipt-engine-ffi/Cargo.toml	Bumped version to 0.11.0
flipt-client-go/config.go	Added WithTlsConfig option for custom TLS clients
flipt-client-go/client_test.go	Test suite now reads CA certs and applies TLS config
flipt-client-go/README.md	Added TLS Configuration section and examples

Comments suppressed due to low confidence (2)

flipt-client-go/config.go:98

• Function name 'WithTlsConfig' should use consistent acronym casing, e.g. 'WithTLSConfig', to follow Go naming conventions for acronyms.

func WithTlsConfig(tlsConfig *tls.Config) Option {

flipt-client-go/README.md:128

• Update the documented option name to 'WithTLSConfig' to match the actual exported function name and maintain consistency.

- `WithTlsConfig`: The TLS configuration for connecting to servers with custom certificates. See [TLS Configuration](#tls-configuration).

[erka]

nice