Add multi-distribution ostree backport support for Ubuntu Noble and Debian Trixie

- Add main ostree-backport.sh script with distribution selection
- Add wrapper scripts: backport-noble.sh and backport-trixie.sh
- Add usage-guide.sh for comprehensive documentation
- Update CI/CD workflows with improved multi-distribution support
- Add test-build.yml workflow for quick validation
- Update README.md with multi-distribution documentation
- Add CI-CD-IMPROVEMENTS.md with detailed workflow documentation
- Remove old .deb files (steam.deb, wget_1.21.4-1ubuntu4.1_amd64.deb)

Features:
- Ubuntu Noble: Source from Questing, target Noble
- Debian Trixie: Source from sid, target Trixie
- Enhanced error handling and logging
- Manual triggers for single/all distributions
- Comprehensive CI/CD documentation

CI-CD-IMPROVEMENTS.md

@@ -0,0 +1,138 @@
+# CI/CD Improvements Summary
+
+## 🚀 Enhanced Workflows
+
+### 1. Main Build Workflow (`build-ostree-backports.yml`)
+**Key Improvements:**
+- ✅ **Matrix Strategy**: Proper multi-distribution support with dynamic matrix generation
+- ✅ **Manual Triggers**: Support for single distribution or all distributions
+- ✅ **Better Error Handling**: Comprehensive error checking and exit codes
+- ✅ **Detailed Logging**: Step-by-step progress with distribution-specific context
+- ✅ **Upload Statistics**: Success/failure counters with warnings
+- ✅ **Package Path Configuration**: Distribution-specific upload paths
+
+**New Features:**
+- `build_all` parameter for building both distributions simultaneously
+- Distribution-specific package upload paths (`noble/main`, `trixie/main`)
+- Enhanced error reporting with GitHub Actions warnings
+- Improved source download with error checking
+
+### 2. Test Workflow (`test-build.yml`)
+**Purpose:**
+- Quick validation of build process
+- Tests source download from both distributions
+- Verifies source extraction and changelog modification
+- Fast feedback before full builds
+
+**Features:**
+- Manual trigger with distribution selection
+- Step-by-step validation
+- Clear success/failure reporting
+
+## 🎯 Manual Trigger Options
+
+### Single Distribution Build
+```yaml
+workflow_dispatch:
+  inputs:
+    target_distro: noble  # or trixie
+    build_all: false
+```
+
+### All Distributions Build
+```yaml
+workflow_dispatch:
+  inputs:
+    target_distro: noble  # ignored when build_all=true
+    build_all: true
+```
+
+### Test Mode
+```yaml
+workflow_dispatch:
+  inputs:
+    target_distro: noble  # or trixie
+```
+
+## 📊 Matrix Configuration
+
+### Ubuntu Noble
+```yaml
+- target_distro: noble
+  distro_type: ubuntu
+  source_release: questing
+  target_release: noble
+  backport_suffix: ~noble1
+  pool_url: http://archive.ubuntu.com/ubuntu/pool/universe/o/ostree/
+  sources_list: "deb-src http://us.archive.ubuntu.com/ubuntu/ noble main universe"
+  package_upload_path: noble/main
+```
+
+### Debian Trixie
+```yaml
+- target_distro: trixie
+  distro_type: debian
+  source_release: sid
+  target_release: trixie
+  backport_suffix: ~trixie1
+  pool_url: http://deb.debian.org/debian/pool/main/o/ostree/
+  sources_list: "deb-src http://deb.debian.org/debian/ trixie main contrib non-free"
+  package_upload_path: trixie/main
+```
+
+## 🔧 Error Handling Improvements
+
+### Source Download
+```bash
+wget "${POOL_URL}ostree_${OSTREE_VERSION}-${OSTREE_DEBIAN_REVISION}.dsc" || exit 1
+wget "${POOL_URL}ostree_${OSTREE_VERSION}.orig.tar.xz" || exit 1
+wget "${POOL_URL}ostree_${OSTREE_VERSION}-${OSTREE_DEBIAN_REVISION}.debian.tar.xz" || exit 1
+```
+
+### Build Process
+```bash
+dpkg-source -x "ostree_${OSTREE_VERSION}-${OSTREE_DEBIAN_REVISION}.dsc" || exit 1
+apt-get build-dep -y --no-install-recommends ./ || exit 1
+dpkg-buildpackage -us -uc -b || exit 1
+```
+
+### Upload Statistics
+```bash
+upload_success=0
+upload_failed=0
+# ... upload logic ...
+echo "Upload Summary for ${{ matrix.target_distro }}:"
+echo "  ✅ Successful uploads: $upload_success"
+echo "  ❌ Failed uploads: $upload_failed"
+```
+
+## 📈 Benefits
+
+1. **Reliability**: Better error handling prevents silent failures
+2. **Flexibility**: Support for single or multi-distribution builds
+3. **Debugging**: Detailed logging for troubleshooting
+4. **Testing**: Quick validation workflow for rapid iteration
+5. **Monitoring**: Upload statistics and success tracking
+6. **Maintainability**: Clear separation of concerns and configuration
+
+## 🎯 Usage Examples
+
+### GitHub Actions UI
+1. Go to Actions → Build ostree Backports
+2. Click "Run workflow"
+3. Select target distribution or "Build all"
+4. Monitor progress with detailed logging
+
+### Test Mode
+1. Go to Actions → Test ostree Build
+2. Click "Run workflow"
+3. Select distribution to test
+4. Quick validation of build process
+
+## 📋 Workflow Files
+
+- `build-ostree-backports.yml` - Main multi-distribution build workflow
+- `test-build.yml` - Quick validation workflow
+- `build-libostree-backport.yml` - Legacy single-distribution workflow (kept for reference)
+- `manual-update-readme.yml` - Documentation update workflow
+- `update-readme.yml` - Automated README updates