Add iOS build.

.github/workflows/test.yml

@@ -34,3 +34,6 @@ jobs:
       - uses: actions/checkout@v2
       - run: |
           cargo build --release
+          cargo install cargo-lipo
+          rustup target add aarch64-apple-ios armv7-apple-ios armv7s-apple-ios
+          cargo lipo --release

Cargo.toml

@@ -8,6 +8,10 @@ license = "MIT"
 exclude = ["*.cfg", "*.yml"]
 edition = "2018"
 
+[lib]
+name = "tts"
+crate-type = ["staticlib", "cdylib"]
+
 [dependencies]
 log = "0.4"
 thiserror = "1"