refactor: replace GitHub Actions with native commands in security-scan workflow

- Remove actions/checkout@v4, shivammathur/setup-php@v2, actions/cache@v3
- Replace with native shell commands (git clone, apt-get, simple file cache)
- Should be much faster (no GitHub Action downloads)
- Eliminates dependency on GitHub for action downloads

.gitea/workflows/security-scan.yml

@@ -17,42 +17,84 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        run: |
+          REF_NAME="${{ github.ref_name }}"
+          REPO="${{ github.repository }}"
+          if [ -z "$REF_NAME" ]; then
+            REF_NAME="main"
+          fi
+          
+          git clone --depth 1 --branch "$REF_NAME" \
+            "https://git.michaelschiemer.de/${REPO}.git" \
+            /workspace/repo || \
+          git clone --depth 1 --branch "$REF_NAME" \
+            "git@git.michaelschiemer.de:${REPO}.git" \
+            /workspace/repo || \
+          git clone --depth 1 \
+            "https://git.michaelschiemer.de/${REPO}.git" \
+            /workspace/repo
+          
+          cd /workspace/repo
 
       - name: Setup PHP
-        uses: https://github.com/shivammathur/setup-php@v2
-        with:
-          php-version: '8.4'
-          extensions: dom, curl, libxml, mbstring, zip, pcntl, pdo, sqlite, pdo_sqlite, bcmath, soap, intl, gd, exif, iconv, sodium
-          coverage: none
+        run: |
+          apt-get update
+          apt-get install -y \
+            php8.4 \
+            php8.4-cli \
+            php8.4-dom \
+            php8.4-curl \
+            php8.4-xml \
+            php8.4-mbstring \
+            php8.4-zip \
+            php8.4-pcntl \
+            php8.4-pdo \
+            php8.4-pdo-sqlite \
+            php8.4-bcmath \
+            php8.4-soap \
+            php8.4-intl \
+            php8.4-gd \
+            php8.4-exif \
+            php8.4-iconv \
+            php8.4-sodium \
+            composer
 
       - name: Validate composer.json and composer.lock
         run: |
+          cd /workspace/repo
           # Validate composer.json (less strict - lock file might be updated during install)
           composer validate --no-check-lock || echo "⚠️ composer.lock might need update, but continuing..."
           # Try to update lock file if needed
           composer update --lock --no-interaction || echo "⚠️ Could not update lock file, but continuing..."
 
-      - name: Cache Composer packages
-        uses: actions/cache@v3
-        with:
-          path: vendor
-          key: ${{ runner.os }}-php-${{ hashFiles('**/composer.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-php-
+      - name: Cache Composer packages (simple)
+        run: |
+          if [ -d "/tmp/composer-cache/vendor" ]; then
+            echo "📦 Restoring cached dependencies..."
+            cp -r /tmp/composer-cache/vendor /workspace/repo/vendor || true
+          fi
 
       - name: Install dependencies
-        run: composer install --prefer-dist --no-progress --no-dev
+        run: |
+          cd /workspace/repo
+          composer install --prefer-dist --no-progress --no-dev
+
+      - name: Save Composer cache
+        run: |
+          mkdir -p /tmp/composer-cache
+          cp -r /workspace/repo/vendor /tmp/composer-cache/vendor || true
 
       - name: Run Composer Security Audit
         id: security-audit
         run: |
+          cd /workspace/repo
           composer audit --format=json > audit-result.json || true
           cat audit-result.json
 
       - name: Parse audit results
         id: parse-audit
         run: |
+          cd /workspace/repo
           if [ -f audit-result.json ]; then
             # Check if jq is available, install if not
             if ! command -v jq &> /dev/null; then
@@ -96,13 +138,15 @@ jobs:
             fi
           fi
 
-      - name: Upload audit results as artifact
+      - name: Save audit results
         if: always()
-        uses: actions/upload-artifact@v3
-        with:
-          name: security-audit-results-${{ github.run_number }}
-          path: audit-result.json
-          retention-days: 30
+        run: |
+          cd /workspace/repo
+          if [ -f audit-result.json ]; then
+            mkdir -p /tmp/artifacts
+            cp audit-result.json /tmp/artifacts/security-audit-results-${{ github.run_number }}.json || true
+            echo "✅ Audit results saved"
+          fi
 
       - name: Create Gitea issue on vulnerability (scheduled runs only)
         if: failure() && github.event_name == 'schedule'