Add dependabot, add matrix for ios targets in ci

Author: simlay

.github/dependabot.yml

@@ -0,0 +1,14 @@
+version: 2
+updates:
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      # Check for updates to GitHub Actions every weekday
+      interval: "daily"
+
+  # Maintain dependencies for Cargo
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/coreaudio-sys.yml

@@ -24,10 +24,31 @@ jobs:
     - name: cargo test - all features
       run: cargo test --all-features --verbose
 
+  ios-check:
+    runs-on: macOS-latest
+    strategy:
+      matrix:
+        toolchain: [stable, nightly]
+        target: [aarch64-apple-ios, x86_64-apple-ios, aarch64-apple-ios-sim]
+    steps:
+    - uses: actions/checkout@v2
+    - name: Install stable rust toolchain
+      uses: actions-rs/toolchain@v1
+      with:
+        profile: minimal
+        toolchain: ${{ matrix.toolchain }}
+        override: true
+
+    - name: Install LLVM and Clang
+      uses: KyleMayes/install-llvm-action@v1.5.0
+      with:
+        version: "13.0"
+
     - name: add ios targets
-      run: rustup target add aarch64-apple-ios x86_64-apple-ios
-    - name: Build ios targets
-      run: for i in aarch64-apple-ios x86_64-apple-ios; do cargo build --verbose --target=$i; done
+      run: rustup target add ${{matrix.target}}
+
+    - name: Build for iOS target ${{matrix.target}}
+      run: cargo build --verbose --target=${{matrix.target}}
 
   # Build the docs with all features to make sure docs.rs will work.
   macos-docs: