Add CodeQL Workflow

.github/workflows/codeql.yml

@@ -0,0 +1,69 @@
+# This workflow configures CodeQL as the auto-configuration fails for Java/Kotlin.
+#
+# @author Armin Schnabel
+# @version 1.0.0
+# @since 4.2.0
+name: "CodeQL Analysis"
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  schedule:
+    - cron: '23 11 * * 2'
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ${{ (matrix.language == 'swift' && 'macos-latest') || 'ubuntu-latest' }}
+
+    permissions:
+      # required for all workflows
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - language: java-kotlin
+            build-mode: manual # autobuild fails (gradle.properties required)
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v2
+        with:
+          # 'java-kotlin' to analyze code written in Java, Kotlin or both
+          languages: ${{ matrix.language }}
+          build-mode: ${{ matrix.build-mode }}
+
+      - name: Set up JDK
+        uses: actions/setup-java@v3
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Cache Gradle dependencies
+        uses: actions/cache@v3
+        with:
+          path: ~/.gradle/caches
+          # Only update cache on hash change (gradle build files and the wrapper properties)
+          key: gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+          restore-keys: gradle-
+
+      #- name: Grant execute permission for Gradle wrapper
+      #  run: chmod +x gradlew
+
+      - name: Add gradle.properties
+        run: cp gradle.properties.template gradle.properties
+
+      - name: Build with Gradle
+        run: ./gradlew build
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@v3
+        with:
+          category: "/language:${{matrix.language}}"

.github/workflows/gradle_build.yml

@@ -34,5 +34,13 @@ jobs:
       run: |
         cp gradle.properties.template gradle.properties
 
+    - name: Cache Gradle dependencies
+      uses: actions/cache@v3
+      with:
+        path: ~/.gradle/caches
+        # Only update cache on hash change (gradle build files and the wrapper properties)
+        key: gradle-${{ hashFiles('**/*.gradle*', '**/gradle-wrapper.properties') }}
+        restore-keys: gradle-
+
     - name: Build with Gradle
       run: ./gradlew build