Add a new GitHub Action to streamline our release process by generating reproducible builds via workflow.

• The action should be triggered on both tag push and workflow dispatch events.
• The action should produce builds for Fedora, Ubuntu Focal, Ubuntu Jammy, and Ubuntu Noble, along with a .zip file for upload on the release page.
• This will also require to integrate functionality from tools/repro-build.sh
• Remove unused Dockerfiles and scripts for a cleaner codebase. But do not delete the build-release and repro-build scripts as they are still essential for release verification and signing by other team members.