Add support for connecting through Unix socket

[alexandre-daubois]

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[Copilot]

Pull request overview

This PR adds first-class support for connecting to Caddy’s admin API via a Unix domain socket (in addition to existing HTTP/HTTPS support), updating the fetcher, CLI validation/help text, and documentation accordingly.

Changes:

• Add Unix-socket dialing support to HTTPFetcher and expose IsUnixSocket() so TLS config/reload can be skipped appropriately.
• Extend CLI validation and tests to accept unix//... / unix:///... addresses and disallow TLS options with Unix sockets.
• Document Unix-socket usage across README and docs (CLI reference, Caddy configuration, Docker).

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
README.md	Mentions Unix socket support in the feature list.
internal/fetcher/http.go	Adds Unix-socket transport dialing and IsUnixSocket().
internal/fetcher/http_test.go	Adds unit + integration tests for Unix-socket fetching.
internal/app/run.go	Updates CLI help/flags; skips TLS config when using Unix sockets; validates unix//.
internal/app/run_test.go	Adds validation tests for Unix socket addresses and TLS-option incompatibility.
internal/app/daemon.go	Skips TLS reload when using a Unix-socket connection.
docs/docker.md	Adds Docker/Docker Compose guidance for mounting and using the admin socket.
docs/cli-reference.md	Updates --addr and EMBER_ADDR docs + examples for Unix sockets.
docs/caddy-configuration.md	Documents configuring Caddy admin via Unix socket and connecting Ember to it.
cmd/ember/main_test.go	Updates expected validation error text for invalid --addr.

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[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

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[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated no new comments.

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