Enable CodeQL Scanning (#22)

.github/workflows/codeql.yml

@@ -0,0 +1,52 @@
+name: "CodeQL Scan"
+
+on:
+  workflow_dispatch:
+  pull_request:
+    types: [synchronize, opened, reopened, ready_for_review]
+    branches: 
+    - main
+    - features/automatic-update
+  push:
+    branches:
+    - main
+    - features/automatic-update
+#Twice a month at 5:00 AM too.
+  schedule:
+    - cron: '0 5 1,15 * *'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: [ 'macos-latest' ]
+    timeout-minutes: 120
+    permissions:
+      # required for all workflows
+      security-events: write
+
+      # only required for workflows in private repositories
+      actions: read
+      contents: read
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: 'swift'
+        queries: security-extended,security-and-quality
+
+#Building manually, since Autobuild can't figure this one out...
+    - name: Create Xcode project
+      run: swift package generate-xcodeproj
+
+    - name: Build Xcode project
+      run: xcodebuild -sdk iphonesimulator
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:swift"