Add CI workflow for building the app

.github/workflows/build-app.yml

@@ -0,0 +1,29 @@
+name: Build macOS app
+on: [push]
+jobs:
+  build:
+    name: Build Xcode app project 
+    runs-on: macos-latest
+    env:
+      APP_NAME: Commandoak
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Select Xcode version
+        run: sudo xcode-select --switch /Applications/Xcode_15.2.app
+
+      - name: Build macOS app
+        run: |
+          xcodebuild \
+            -project ${{ env.APP_NAME }}.xcodeproj \
+            -scheme ${{ env.APP_NAME }} \
+            -configuration Release \
+            -sdk macosx \
+            archive -archivePath build/${{ env.APP_NAME }}.xcarchive
+
+      - name: Archive artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ env.APP_NAME }}
+          path: build/${{ env.APP_NAME }}.xcarchive

Commandoak.xcodeproj/xcshareddata/xcschemes/Commandoak.xcscheme

@@ -0,0 +1,77 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1520"
+   version = "1.7">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "8B50B1E22B8B8084006CBF57"
+               BuildableName = "Commandoak.app"
+               BlueprintName = "Commandoak"
+               ReferencedContainer = "container:Commandoak.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      shouldAutocreateTestPlan = "YES">
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "8B50B1E22B8B8084006CBF57"
+            BuildableName = "Commandoak.app"
+            BlueprintName = "Commandoak"
+            ReferencedContainer = "container:Commandoak.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Release"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "8B50B1E22B8B8084006CBF57"
+            BuildableName = "Commandoak.app"
+            BlueprintName = "Commandoak"
+            ReferencedContainer = "container:Commandoak.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>