Adding an example darwin github workflow

We should build the darwin examples through CI to ensure they work
correctly

Fixes: project-chip#25702

.github/workflows/examples-darwin.yaml

@@ -0,0 +1,72 @@
+# Copyright (c) 2023 Project CHIP Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: Build Example - Darwin
+
+on:
+    push:
+    pull_request:
+    merge_group:
+    workflow_dispatch:
+
+concurrency:
+    group: ${{ github.ref }}-${{ github.workflow }}-${{ (github.event_name == 'pull_request' && github.event.number) || (github.event_name == 'workflow_dispatch' && github.run_number) || github.sha }}
+    cancel-in-progress: true
+
+jobs:
+    darwin:
+        name: Build Example - Darwin
+        timeout-minutes: 60
+
+        if: github.actor != 'restyled-io[bot]'
+        runs-on: macos-latest
+
+        steps:
+            - uses: Wandalen/[email protected]
+              name: Checkout
+              with:
+                  action: actions/checkout@v3
+                  with: |
+                      token: ${{ github.token }}
+                  attempt_limit: 3
+                  attempt_delay: 2000
+            - name: Checkout submodules
+              run: scripts/checkout_submodules.py --shallow --platform darwin
+            - name: Setup Environment
+              run: brew install [email protected]
+
+            - name: Bootstrap cache
+              uses: actions/cache@v3
+              timeout-minutes: 10
+              with:
+                  key: ${{ runner.os }}-env-${{ hashFiles('scripts/setup/*', 'third_party/pigweed/**') }}
+                  path: |
+                      .environment
+                      build_overrides/pigweed_environment.gni
+            - name: Bootstrap
+              timeout-minutes: 25
+              run: scripts/build/gn_bootstrap.sh
+            - name: Uploading bootstrap logs
+              uses: actions/upload-artifact@v3
+              if: ${{ always() && !env.ACT }}
+              with:
+                  name: bootstrap-logs
+                  path: |
+                      .environment/gn_out/.ninja_log
+                      .environment/pigweed-venv/*.log
+            - name: Build Matter TV Casting Bridge
+              timeout-minutes: 20
+              run: |
+                  xcodebuild -target "MatterTvCastingBridge" -sdk iphoneos
+              working-directory: examples/tv-casting-app/darwin/MatterTvCastingBridge