Set up CI using GitHub Actions

.github/workflows/check.yml

@@ -0,0 +1,30 @@
+name: Check
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+jobs:
+  check:
+    runs-on: macos-15
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v4
+    - name: Set up Xcode
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: "16.4"
+    - name: XcodeGen
+      uses: xavierLowmiller/xcodegen-action@1.2.4
+      with:
+        spec: project.yml
+        version: 2.43.0
+    - name: Run iOS tests
+      run: |
+        set -o pipefail && xcodebuild test \
+          -scheme bitchatTests_iOS \
+          -destination "platform=iOS Simulator,name=iPhone 16" | xcpretty