Further DRY with xcodegen

.github/workflows/tests.yml

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+name: Run tests on all examples
+
+on:
+  push
+
+jobs:
+  build_and_test:
+    strategy:
+      matrix:
+        folder:
+          - 04-tdd-in-the-real-world
+          - 05-fixtures
+          - 06-testing-static-swiftui-views
+          - 07-testing-dynamic-swiftui-views
+          - 08-stub
+          - 09-json-decoding
+          - 10-networking
+          - 11-dependency-injection-with-environment-object
+          - 12-spy
+          - 13-testing-view-presentation
+          - 14-fixing-bugs-and-changing-code
+          - 15-fake-and-dummy
+          - 17-appendix-b-nimble-only
+          - 18-appendix-b-quick-and-nimble
+          - 19-appendix-c-uikit
+    runs-on: macos-14
+    steps:
+      - name: Check Xcode version
+        run: /usr/bin/xcodebuild -version
+
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Test examples ${{ matrix.folder }}
+        run: |
+          brew install xcodegen
+          cd ./${{ matrix.folder }}
+          echo "Currently in $(pwd)"
+          make

.gitignore

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+.DS_Store
+# If Xcode is setup to use a local derived data folder (recommended), ignore it
+DerivedData
+
+# Ignore xcodeproj because we codegenerate them
+*.xcodeproj
+# Ignore Info.plist because we codegen that, too
+Info.plist
+
+# SwiftPM
+.build

.xcode-version

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+16.0