Add App CI

Signed-off-by: Kaito Udagawa <umireon@kaito.tokyo>

Author: umireon

.github/workflows/app-build-macos.yml

@@ -0,0 +1,52 @@
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+
+# SPDX-FileCopyrightText: 2026 Kaito Udagawa <umireon@kaito.tokyo>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: App build macOS
+
+# file: .github/workflows/app-build-macos.yml
+# author: Kaito Udagawa <umireon@kaito.tokyo>
+# date: 2026-06-29
+
+on:
+  workflow_call:
+    inputs:
+      environment:
+        description: Runner environment
+        required: false
+        type: string
+        default: ''
+
+permissions: {}
+
+env:
+  HOMEBREW_NO_ANALYTICS: '1'
+  HOMEBREW_NO_AUTO_UPDATE: '1'
+  HOMEBREW_NO_ENV_HINTS: '1'
+  HOMEBREW_NO_INSTALL_CLEANUP: '1'
+
+jobs:
+  app-build-macos-swift:
+    runs-on: macos-26
+
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
+
+      - name: Generate project using XcodeGen
+        shell: bash --noprofile --norc -euo pipefail -O nullglob {0}
+        run: |
+          brew install xcodegen
+          xcodegen generate
+
+      - name: Build
+        shell: bash --noprofile --norc -euo pipefail -O nullglob {0}
+        run: |
+          xcodebuild

.github/workflows/app.yml

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+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+
+# SPDX-FileCopyrightText: 2026 Kaito Udagawa <umireon@kaito.tokyo>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: App CI
+
+# file: .github/workflows/app.yml
+# author: Kaito Udagawa <umireon@kaito.tokyo>
+# date: 2026-06-29
+
+on:
+  pull_request:
+    branches: [main]
+  merge_group:
+  push:
+    branches: [main]
+    tags: ['*']
+
+permissions: {}
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  app-build-macos:
+    permissions:
+      contents: read
+    uses: ./.github/workflows/app-build-macos.yml
+
+  accept-app:
+    if: always()
+    needs:
+      - app-build-macos
+    runs-on: ubuntu-slim
+    permissions: {}
+    steps:
+      - name: Check job results
+        run: |
+          [[ "${{ needs.app-build-macos.result }}" == 'success' ]]