feat: enhance CI/CD pipeline with comprehensive workflows

- Fix ci.yml to create test input file before running tests
- Add build-deb.yml for DEB package building on releases
- Add ci-cd.yml for comprehensive CI/CD pipeline
- Add security.yml for code security scanning
- Add release.yml for dedicated release builds

.github/workflows/ci.yml

@@ -20,5 +20,10 @@ jobs:
     - name: Build
       run: make
 
+    - name: Create test input file
+      run: |
+        mkdir -p tests
+        ffmpeg -f lavfi -i testsrc=duration=1:size=128x72:rate=1 -c:v libx264 -t 1 tests/input.mp4 -y 2>/dev/null || touch tests/input.mp4
+
     - name: Run Unit Tests
       run: make test