Add test-swift workflow

.github/workflows/test-swift.yaml

@@ -0,0 +1,51 @@
+name: Test Swift
+on:
+  push:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-swift/**"
+  pull_request:
+    paths:
+      - "bdk-ffi/**"
+      - "bdk-swift/**"
+
+jobs:
+  build:
+    runs-on: macos-12
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@v2
+
+      - name: Install Rust targets
+        run: |
+          rustup install nightly-x86_64-apple-darwin
+          rustup component add rust-src --toolchain nightly-x86_64-apple-darwin
+          rustup target add aarch64-apple-darwin x86_64-apple-darwin
+
+      - name: Run bdk-ffi-bindgen
+        working-directory: bdk-ffi
+        run: cargo run --package bdk-ffi-bindgen -- --language swift --out-dir ../bdk-swift/Sources/BitcoinDevKit
+
+      - name: Build bdk-ffi for x86_64-apple-darwin
+        run: cargo build --profile release-smaller --target x86_64-apple-darwin
+
+      - name: Build bdk-ffi for aarch64-apple-darwin
+        run: cargo build --profile release-smaller --target aarch64-apple-darwin
+
+      - name: Create lipo-ios-sim and lipo-macos
+        run: |
+          mkdir -p target/lipo-macos/release-smaller
+          lipo target/aarch64-apple-darwin/release-smaller/libbdkffi.a target/x86_64-apple-darwin/release-smaller/libbdkffi.a -create -output target/lipo-macos/release-smaller/libbdkffi.a
+
+      - name: Create bdkFFI.xcframework
+        working-directory: bdk-swift
+        run: |
+          mv Sources/BitcoinDevKit/bdk.swift Sources/BitcoinDevKit/BitcoinDevKit.swift
+          cp Sources/BitcoinDevKit/bdkFFI.h bdkFFI.xcframework/macos-arm64_x86_64/bdkFFI.framework/Headers
+          cp ../target/lipo-macos/release-smaller/libbdkffi.a bdkFFI.xcframework/macos-arm64_x86_64/bdkFFI.framework/bdkFFI
+          rm Sources/BitcoinDevKit/bdkFFI.h
+          rm Sources/BitcoinDevkit/bdkFFI.modulemap
+
+      - name: Run Swift tests
+        working-directory: bdk-swift
+        run: swift test