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d0aa8eb5 - feat: add GHA workflow to build opencv wheels without ffmpeg (#4335)

feat: add GHA workflow to build opencv wheels without ffmpeg (#4335) ## Summary - Adds a `workflow_dispatch` GHA workflow that builds `opencv-python-headless` from source with `WITH_FFMPEG=OFF` on amd64 and arm64 - Wheels are uploaded as a GitHub release so Dockerfiles can download them at build time - Eliminates the 14 bundled ffmpeg CVEs present in the stock PyPI wheels ## Test plan - [ ] Trigger the workflow manually with the default inputs (`opencv-python-headless==4.12.0.88`) - [ ] Verify wheels are produced for both architectures - [ ] Verify the GitHub release is created with both wheels attached - [ ] Confirm the built wheels have no `.libs` directory (no bundled ffmpeg) 🤖 Generated with [Claude Code](https://claude.com/claude-code) <!-- CURSOR_SUMMARY --> --- > [!NOTE] > **Low Risk** > Low risk: changes are confined to GitHub Actions workflows, with the main impact being additional CI/release automation and a simple tag-based guard on PyPI publishing. > > **Overview** > Adds a new `workflow_dispatch` GitHub Actions workflow to build `opencv-contrib-python-headless` wheels from source for `amd64` and `arm64` with `WITH_FFMPEG=OFF`, validate the resulting `cv2` install has *no* bundled `.libs` and includes key contrib modules, and publish the wheels via a GitHub Release. > > Updates the existing release workflow to **skip** tags prefixed with `opencv-`, preventing these wheel-only releases from triggering the normal PyPI publish job. > > ^{Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit f03df11f0e35e226737d9146f3ac2145999fcdbe. Bugbot is set up for automated code reviews on this repo. Configure [here](https://www.cursor.com/dashboard/bugbot).} <!-- /CURSOR_SUMMARY --> --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>