feat: add internal iOS push MVP

Signed-off-by: Tom Brow <tomb@squareup.com>

.github/workflows/ci.yml

@@ -63,6 +63,7 @@ jobs:
               - 'pnpm-lock.yaml'
             mobile:
               - 'mobile/**'
+              - 'crates/buzz-push-gateway/tests/vectors/**'
               - 'scripts/mobile-release.sh'
               - 'scripts/mobile-worktree-overrides.sh'
               - 'scripts/mobile-worktree-clean.sh'
@@ -71,6 +72,7 @@ jobs:
               - 'scripts/test-mobile-release-contract.sh'
               - 'scripts/test-mobile-release-candidate-publisher.sh'
               - 'scripts/test-mobile-worktree-overrides.sh'
+              - 'scripts/test-ios-pbxproj-semantics.py'
               - '.github/workflows/mobile-release-candidate.yml'
               - '.github/workflows/ci.yml'
       - name: Release workflow source contract
@@ -900,6 +902,23 @@ jobs:
       - name: Build Android debug APK
         run: just mobile-build-android
 
+  mobile-swift:
+    name: Mobile Swift
+    runs-on: macos-latest
+    timeout-minutes: 10
+    needs: [changes]
+    if: needs.changes.outputs.mobile == 'true'
+    steps:
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6
+      - name: Build
+        run: swift build --package-path mobile/ios/BuzzPushKit
+      - name: Build release
+        run: swift build -c release --package-path mobile/ios/BuzzPushKit
+      - name: Test
+        run: swift test --package-path mobile/ios/BuzzPushKit
+      - name: Validate iOS project semantics
+        run: python3 scripts/test-ios-pbxproj-semantics.py
+
   security:
     name: Security
     runs-on: ubuntu-latest