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In order to reduce the CI build times for the Ubuntu artifacts, use a Docker base image that already contains OBS dependencies.

- Resolved merge conflict in .github/workflows/manual-e2e-test.yaml
- Kept main branch version for consistency
- Added E2E test workflows and scripts from main branch
- Maintained dockerized Ubuntu build focus of this branch
…dency

- Changed ubuntu-build job from containerized to standard ubuntu-24.04 runner
- Added explicit dependency installation step for build tools
- Removed dependency on build-docker-image job to prevent container access issues
- This resolves startup failures caused by Docker image access permissions on feature branches
- The build-docker-image job was trying to access GitHub Container Registry
- This requires packages: write permissions which may not be available on feature branches
- Removing this job eliminates the startup failure while maintaining the standard Ubuntu build
- Docker image building can be re-added later when container registry access is properly configured
…ovement

- Add containerized build workflows for fast CI execution
- Create pre-built Ubuntu container with OBS Studio and Qt6 dependencies
- Implement flexible build system supporting both containerized and traditional builds
- Add containerized E2E test workflow with full display and dependency support
- Create Docker image build/publish workflow with monthly auto-updates
- Update main workflows (push, dispatch, PR) to use containerized builds by default
- Add comprehensive test script and migration documentation
- Fix critical shell script issues (removed 'local' keyword usage in GitHub Actions)
- Resolve circular workflow dependencies and YAML formatting issues

Performance improvements:
- Traditional build: ~4.5 minutes (3.5min APT + 1min build)
- Dockerized build: ~1-2 minutes (0.5min container + 1min build)
- Speed improvement: 60-75% faster CI builds

The implementation preserves full backward compatibility and includes automatic
fallback to traditional builds if containerized builds fail.
- Add automatic Docker image building when missing or older than 7 days
- Create bootstrap workflow for initial image creation
- Implement automatic fallback from containerized to traditional builds
- Simplify image availability checks with robust error handling
- Ensure builds work completely automatically regardless of trigger method
- Add proper dependency chains between containerized and traditional builds

The system now works fully automatically:
- First run: automatically builds Docker image then uses it
- Subsequent runs: uses existing image if < 7 days old
- Image too old: automatically rebuilds and uses new image
- Any failure: automatically falls back to traditional build
- No manual intervention required for any scenario
- Remove unnecessary bootstrap-docker.yaml workflow
- Replace complex image checking with simple multi-stage Docker build
- Use existing Dockerfile.multi-stage for self-contained builds
- Extract plugin binary from container automatically
- No pre-built images required - builds everything as needed
- Zero manual steps - works on any push/merge/tag/manual trigger
- Automatic fallback to traditional builds if Docker fails

The build now 'just works':
1. Uses multi-stage Docker build (no pre-existing images needed)
2. Builds Ubuntu environment + plugin in one step
3. Extracts plugin binary automatically
4. Falls back to traditional build if any issues
5. Completely automatic - no bootstrap or manual steps required
- Add missing Windows build job that was accidentally removed
- Simplify E2E testing by removing duplicate containerized/traditional jobs
- Use single E2E job that works with whichever Ubuntu build succeeded
- Remove unnecessary complexity in fallback system

Build flow now: Check Event -> (Ubuntu Containerized OR Ubuntu Traditional) + macOS + Windows -> Single E2E Test

This fixes both issues:
1. Windows builds are restored and working
2. E2E complexity removed - one job handles both scenarios automatically
- Replace confusing multi-file structure with clean single workflow
- Integrate Docker-based Ubuntu builds with automatic image management
- Embed E2E testing directly instead of separate workflows
- Remove 6 obsolete workflow files (build-docker-images, build-project-flexible, containerized-*, e2e-test, manual-e2e-test)
- Update entry point workflows to use simplified interface
- Maintain all functionality while eliminating complexity

Architecture: Build Docker Image -> Ubuntu Build -> E2E Test
- Add dedicated manual-e2e-test.yaml workflow for on-demand E2E testing
- Support multiple plugin sources: latest_build, latest_release, specific_release
- Add e2e-test option to dispatch.yaml workflow
- Maintains all functionality from removed manual-e2e-test.yaml
- Uses same containerized approach with automatic plugin installation
- Downloads artifacts via nightly.link (no auth required)

Usage:
- GitHub Actions → Manual E2E Test → Run workflow
- GitHub Actions → Dispatch → e2e-test option
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