Add CI (#2)

Also remove native kotlin tests

They don't work as we only compile for android ABI and they're redundant
with the instrumented/android tests

.github/workflows/ci.yml

@@ -0,0 +1,86 @@
+name: ci
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  CARGO_TERM_COLOR: always
+  RUSTFLAGS: "-Dwarnings"
+  CLASSPATH: "./jna-5.14.0.jar"
+
+jobs:
+  rust:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Rust Cache
+      uses: Swatinem/rust-cache@v2
+      with:
+        cache-on-failure: "true"
+    - name: Build
+      run: cargo build
+
+    - uses: swift-actions/setup-swift@v1
+    - name: Download JNA
+      run: wget https://repo1.maven.org/maven2/net/java/dev/jna/jna/5.14.0/jna-5.14.0.jar
+    - name: Test
+      run: cargo test
+
+    - name: Fmt
+      run: cargo fmt -- --check
+    - name: Clippy
+      run: cargo clippy
+
+  kotlin:
+    runs-on: ubuntu-latest
+    needs: rust
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        targets: "aarch64-linux-android,armv7-linux-androideabi,x86_64-linux-android,i686-linux-android"
+    - name: Rust Cache
+      uses: Swatinem/rust-cache@v2
+      with:
+        cache-on-failure: "true"
+
+    - uses: taiki-e/install-action@v2
+      with:
+        tool: cargo-ndk
+    - uses: actions/setup-java@v3
+      with:
+        java-version: '17'
+        distribution: 'temurin'
+
+    - name: Validate Gradle wrapper
+      uses: gradle/wrapper-validation-action@v1
+    - name: Run tests
+      uses: gradle/gradle-build-action@v2
+      with:
+        arguments: test
+        build-root-directory: ./kotlin
+
+  swift:
+    runs-on: macos-latest
+    needs: rust
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dtolnay/rust-toolchain@stable
+      with:
+        targets: "aarch64-apple-ios-sim,aarch64-apple-ios,x86_64-apple-ios"
+    - name: Rust Cache
+      uses: Swatinem/rust-cache@v2
+      with:
+        cache-on-failure: "true"
+
+    - uses: taiki-e/install-action@v2
+      with:
+        tool: cargo-swift
+
+    - name: Generate Swift package
+      run: cargo swift package -p ios -n WalletSdkRs
+    - name: Fail if generated swift code needs update
+      run: git diff --exit-code WalletSdkRs/Sources/WalletSdkRs/wallet_sdk_rs.swift