fix(build): isolate voip example so the demo build drops cpal/alsa-sys

Cargo.toml

@@ -12,6 +12,7 @@ description = "Rust client for WhatsApp Web"
 [workspace]
 members = [
     ".",
+    "examples/voip-cli",
     "http_clients/ureq-client",
     "storages/sqlite-storage",
     "tests/bench-integration",
@@ -76,7 +77,6 @@ itoa = "1"
 log = "0.4"
 metrics = "0.24"
 portable-atomic = { version = "1", default-features = false, features = ["fallback"] }
-postcard = { version = "1", default-features = false, features = ["use-std"] }
 prost = { version = "0.14.4", default-features = false, features = ["std"] }
 prost-build = { version = "0.14.4", default-features = false }
 prost-types = { version = "0.14.4", default-features = false, features = ["std"] }
@@ -202,19 +202,11 @@ getrandom = { workspace = true, features = ["wasm_js"] }
 aes = { workspace = true }
 async-trait = { workspace = true }
 cbc = { workspace = true, features = ["block-padding"] }
-# Cross-platform audio I/O for the `voip` example only. A dev-dependency, so it
-# never reaches consumers of the published lib (and only compiles when an example
-# that uses it is built). Needs libasound2-dev (ALSA) on Linux.
-cpal = "0.18"
 env_logger = { workspace = true }
 flate2 = { workspace = true }
 hkdf = { workspace = true }
 hmac = { workspace = true }
 metrics-exporter-prometheus = "0.18"
-# Lock-free SPSC ring to hand samples from the async drain task to cpal's
-# realtime output callback without locking or per-callback allocation. voip
-# example only (dev-dependency).
-ringbuf = "0.5"
 sha2 = { workspace = true }
 tokio = { workspace = true, features = ["full"] }
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
@@ -244,10 +236,6 @@ required-features = ["tracing"]
 name = "metrics"
 required-features = ["metrics"]
 
-[[example]]
-name = "voip"
-required-features = ["voip", "sqlite-storage", "tokio-transport", "ureq-client", "tokio-native"]
-
 [profile.release]
 opt-level = 3
 debug = false

examples/voip-cli/Cargo.toml

@@ -0,0 +1,34 @@
+# Standalone crate for the VoIP audio demo. Lives outside the root package so its
+# audio stack (cpal -> alsa-sys, needs ALSA/pkg-config on Linux) never enters the
+# dependency closure of `cargo build --example demo`, which the Docker image runs.
+# A workspace member but not a default-member: plain `cargo build` skips it; build
+# it explicitly with `cargo run -p whatsapp-rust-voip-cli`.
+[package]
+name = "whatsapp-rust-voip-cli"
+version = "0.6.0"
+edition = "2024"
+license = "MIT"
+publish = false
+
+[dependencies]
+anyhow = { workspace = true }
+async-channel = { workspace = true }
+cpal = "0.18"
+env_logger = { workspace = true }
+hex = { workspace = true }
+log = { workspace = true }
+portable-atomic = { workspace = true }
+rand = { workspace = true }
+ringbuf = "0.5"
+tokio = { workspace = true, features = ["full"] }
+wacore = { path = "../../wacore", features = ["voip"] }
+whatsapp-rust = { path = "../..", features = [
+    "voip",
+    "sqlite-storage",
+    "tokio-transport",
+    "ureq-client",
+    "tokio-native",
+] }
+
+[lints]
+workspace = true

tests/e2e/Cargo.toml

@@ -39,7 +39,6 @@ whatsapp-rust-ureq-http-client = { path = "../../http_clients/ureq-client", feat
 env_logger = { workspace = true }
 hex = { workspace = true }
 log = { workspace = true }
-prost = { workspace = true }
 
 [lints]
 workspace = true